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Type metal

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Antimony and tin are added to lead for durability while reducing the difference between the coefficients of expansion of the matrix and the alloy. Apart from durability, the general requirements for type-metal are that it should produce a true and sharp cast, and retain correct dimensions and form after cooling down. It should also be easy to cast, at reasonable low
1350:, which is extremely counterproductive in type metal. Even a tiny amount — less than 1% — will form a dusty surface on the molten metal surface that is difficult to remove. Characters cast from contaminated type metal such as this are of inferior quality, the solution being to discard and replace with fresh alloy. 1334:
has been used for hardening type metal; this metal easily forms mixed crystals with tin when the alloy cools down. These crystals will grow just below the exit opening of the nozzle in Monotype machines, resulting in a total blockage after some time. These nozzles are very difficult to clean, because
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Nowadays this "battle" has lost its importance, at least for Monotype. The quality of the produced type is far more important. Alloys with a high-content of antimony, and subsequently a high content of tin, can be cast at a higher temperature, and at a lower speed and with more cooling at a Monotype
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in different proportions depending on the application, be it individual character mechanical casting for hand setting, mechanical line casting or individual character mechanical typesetting and stereo plate casting. The proportions used are in the range: lead 50‒86%, antimony 11‒30% and tin 3‒20%.
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The addition of a small amount of antimony (5% to 6%) to lead will significantly alter the alloy's behavior compared to pure lead: although the melting point of pure antimony is 630 °C, this mixture will be completely molten and a homogeneous fluid even at temperatures as low as 371 °C.
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Monotype machines however can utilize a wide range of different alloys; maintaining a constant and a high production meant a strict standardization of the typemetal in the company, so as to reduce by all means any interruption of the production. Repeated assays were done at regular intervals to
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Although care was taken to avoid mixing different types of type metal in shops with different type casting systems, in actual practice this often occurred. Since a Monotype composition caster can cope with a variety of different metal alloys, occasional mixing of Linotype alloy with discarded
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Pure metal melts and solidifies in a simple manner at a specific temperature. This is not the case with alloys. There we find a range of temperatures with all kinds of different events. The melting temperature of all mixtures is considerably lower than the pure components.
266:, was heated with scrap iron, metallic antimony was produced. The typefounder would typically introduce powdered stibnite and horseshoe nails into his crucible to melt lead, tin and antimony into type metal. Both the iron and the sulfides would be rejected in the process. 281:
Type metal is an alloy of lead, tin and antimony in different proportions depending on the application, be it individual character mechanical casting for hand setting, mechanical line casting or individual character mechanical typesetting and stereo plate casting.
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will start to form, increasing the cohesion of the liquid alloy. At 252 °C, the mixture will start to fully solidify, during which the temperature will remain constant. Only when the mixture has fully solidified will the temperature start to decrease again.
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Raising the content of antimony cannot be done without adding some tin too. Because the fluidity of the mixture will dramatically diminish when the temperature goes down somewhere in the channels of the machine. Nozzles can be blocked by antimony crystals.
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Alloys used on Monotype machines tend to contain higher contents of tin, to obtain tougher character. All characters should be able to resist the pressure during printing. This meant an extra investment, but Monotype was an expensive system all the way.
1535:, until all is molten and finished. The resulting metal can contain up to 9% of iron. Further purification can be done by mixing the hot melt with kitchen-salt, NaCl. After this red hot lead from another melting pot is added and stirred thoroughly. 214:. This alloy did not shrink as much as lead alone when cooled. Gutenberg's other contributions were the creation of inks that would adhere to metal type and a method of softening handmade printing paper so that it would take the impression well. 174:, iron should not dissolve in the molten metal, and mould and nozzles should stay clean and easy to maintain. Today, Monotype machines can utilize a wide range of different alloys. Mechanical linecasting equipment uses alloys that are close to 362:
The actual compositions differed over time, different machines were adjusted to different alloys depending on the intended uses of the type. Printers had sometimes their own preferences about the quality of particular alloys. The Lanston
327:, that primarily damages brain function. Metallic lead is more stable and less toxic than its oxidized form. Metallic lead cannot be absorbed through contact with skin, so may be handled, carefully, with far less risk than lead oxide. 1200:. These oxides form on the surface of the crucible and must be removed. After stirring the molten metal, grey powder forms on the surface, the dross, needing to be skimmed. Dross contains recoverable amounts of tin and antimony. 1538:
Some tin was added to the alloy for casting small characters and narrow spaces, to better fill narrow areas of the mould. The good properties of tin were well known. The use of tin was sometime minimized to save expenses.
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also made moulds with 'round' nicks. Typefounders and printers could and did order specially designed moulds to their own specifications: height, size, kind of nick, even the number of nicks could be changed.
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The manuals for the Monotype composition caster (1952 and later editions) mention at least five different alloys to be used for casting, depending the purpose of the type and the work to be done with it.
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has many of the ideal characteristics, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks and sags when it cools to a solid.
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Adding tin to this bipolar-system complicates the behaviour even further. Some tin enters into the eutectic. A mixture of 4% tin, 12% antimony, and 84% lead solidifies at 240 °C.
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In Switzerland the company "Metallum Pratteln AG", in Basel had yet another list of type-metal alloys. If needed, any alloy according to customer specifications could be produced.
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Despite patiently trying different proportions of both metals, solving the second part of the type metal problem proved very difficult without the addition of yet a third metal,
206:'s time, his discovery of an alloy that was hard, durable, and would take a clear impression from the mould represents a fundamental aspect of his solution to the problem of 1574:
Now (according to Custom) is Half a Pint of Sack mingled with Sallad Oyl, provided for each Workman to drink; intended or an Antidote against the Poysonous Fumes of the
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When alloyed with lead to produce type metal, antimony gives it the hardness it needs to resist deformation during printing, and gives it sharper castings from the
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The addition of antimony conferred the much needed improvements in the properties of hardness, wear resistance and especially, the sharpness of reproduction of the
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Depending from the metals in excess, compared with the eutectic, crystals are formed, depleting the liquid, until the eutectic 4/12 mixture is formed once more.
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Letting this mixture cool the alloy will remain liquid even through 355 °C, the melting point of pure lead. Once the temperature reaches 291 °C, lead
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Tin (Sn) promotes the fluidity of the molten alloy and makes the type tough, giving the alloy resistance to wear. It is harder, stiffer and tougher than lead.
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The 12/20 alloy contains many mixed crystals of tin and antimony, these crystals constitute the hardness of the alloy and the resistance against wear.
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that are not sharp enough for printing. In addition pure lead letters will quickly deform during use; a direct result of the easy workability of lead.
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Eutectic alloys are used on Linotype-machines and Ludlow-casters to prevent blockage of the mould and to ensure continuous trouble-free casting.
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The proportions used are in the range: lead 50‒86%, antimony 11‒30% and tin 3‒20%. The basic characteristics of these metals are as follows:
186: 245:, improved the ability of the cast type to withstand the wear and tear of the printing process, making it tougher but not more brittle. 1357:, although this metal will float on top of the melt, and will be easily discovered and removed, before it is dissolved into the lead. 1492:. They make it of bricks in an open place, as well because the air may have free access to all its sides, as that the vapours of the 1203:
Dross must be processed at specialized companies, in order to extract the pure metals in conditions that would prevent environmental
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is hardly dissolved into type metal, although the molten metal is always in contact with the cast iron surface of the melting pot.
521:(as opposed to the round nicks used on foundry type), there is no easy way to identify the alloy aside from an expensive chemical 347:
element, which melts at 630 °C (1,166 °F). Antimony has a crystalline appearance while being both brittle and fusible.
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monitor the alloy used, since every time the metal is recycled, roughly half a per cent of tin content is lost through
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has given rise to some lasting fairy tales about typemetal. Linotype users looked down on Monotype and vice versa.
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plates are very dangerous in molten lead, because this metal can easily burn and will ignite in the molten lead.
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together. And preparing so many Earthen forty or fifty pounds Melting-pots (made for that purpose to endure the
46: 1524:). The iron was burned away in this process, reducing the antimony and at the same time removing the unwanted 75: 42: 273:, given that it has the curious property of diminishing the shrinkage of the alloy upon solidification. 57: 1233:
Using a 10% antimony, 90% lead mixture delays lead crystal formation until approximately 260 °C.
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Type produced with these special moulds can only be identified if the foundry or printer is known.
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Type metal is an alloy of lead (Pb). Pure lead is a relatively cheap metal, is soft thus easy to
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Increasing the antimony content beyond 12% will lead to predominantly antimony crystallization.
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Although in general Monotype cast type characters can be visually identified as having a square
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since it melts at 327 °C (621 °F). However, it shrinks when it solidifies making
8: 2049: 1862: 1711: 82: 2003: 1857: 1852: 1578:, and to restore the Spirits that so Violent a Fire and Hard Labour may have exhausted. 1236:
Using a 12% antimony, 88% lead mixture prevents crystal formation entirely, becoming a
518: 302: 203: 126: 2153: 1758: 351: 317: 199: 1935: 1925: 1915: 1892: 1887: 1882: 1284: 499: 121: 1663:, page 168, Sect. XVIII, reprint of the 1896-edition, Thoemmes Press, Bristol, UK. 1650:, page 167, Sect. XVIII, reprint of the 1896-edition, Thoemmes Press, Bristol, UK. 1625:, page 164, Sect. XVIII, reprint of the 1896-edition, Thoemmes Press, Bristol, UK. 2148: 2086: 2027: 1920: 1847: 1528:. In this way ferro-sulfide was formed, that would evaporate with all the fumes. 1395: 1353:
Brass and zinc should therefore be removed before remelting. The same applies to
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The fierce competition between the different mechanical typecasting systems like
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is divided basically into two different competing technologies: line casting (
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Ludlow/Intertype/Linotype composition for limited use and for making stereos
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Metal alloys used in traditional typefounding and hot metal typesetting
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to the inhaled toxic metal fumes, the workers were given a mixture of
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Most durable machine set intended to be remelted, sometimes hand set
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More durable intended for long print runs and curved printing plates
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The mixture of stibnite and nails was heated red hot in an open-air
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Often used on slug casters and for Monotype/Elrod spacing material
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Mechanical linecasting equipment use alloys that are close to
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Type metal alloys mentioned in the UK-Monotype-caster manuals
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1698 illustration of a German typefounder preparing type-metal
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for the best Iron to Melt, as well because they are asured
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Hitherto a Man (nay, a Boy) might officiate all this work.
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Traditional loose hand set type, may contain some copper
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to produce clear, easily read printed text on the page.
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had a whole range of alloys listed in their manuals.
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Every time type metal is remelted, tin and antimony
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After much experimentation it was found that adding
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should not endanger the Firing any adjacent Houses.
49:. Unsourced material may be challenged and removed. 528:Apart from this the two Monotype companies in the 1449:(beaten in an Iron-Morter into small pieces) and 1219: 357: 2140: 1504:: And also because the violent fire made in the 1303:while cleaning the surface of the molten metal. 1321: 1311:typefounders alloy has proven its usefulness. 1278: 1210: 1685: 1189:to replace lost tin and antimony through the 1437:, as because (they being in small pieces of 276: 217: 1692: 1678: 109:Learn how and when to remove this message 1699: 1335:the hard crystals will resist drilling. 185: 120: 1185:Regeneration-metal was melted into the 2141: 1673: 1599:, Great Britain, revised edition 1966 1248: 1542:Much of this toxic work was done by 1441:) will Melt the sooner. To make the 1299:. These oxides are removed with the 47:adding citations to reliable sources 18: 1267:Metals used on typecasting machines 13: 1383:Historic references to type metals 1207:and remain economically feasible. 153:. Historically, type metal was an 14: 2165: 1445:, they mingle an equal weight of 617:(machine & hand composition) 490:Alloys for mechanical composition 1817: 1512:The "antimony" here was in fact 1433:are made of good soft and tough 506:) and single character casting ( 222:Cheap, plentifully available as 23: 34:needs additional citations for 1653: 1640: 1628: 1615: 1602: 1589: 1457:) as they intend to use: They 1220:Antimony/Lead mixture examples 677:Display type, heavy duty jobs 358:Typical type metal proportions 1: 1582: 1610:The Monotype Casting Machine 1461:these Pots with the mingeld 1360: 1322:Contamination of type metals 1307:composition or supercaster. 637:Routine machine composition 308:Lead is exceptionally soft, 202:was well established before 7: 1469:as full as they will hold. 1279:Present usage of type metal 1211:Behaviour of bipolar alloys 338: 10: 2170: 482: 470: 465: 453: 448: 436: 431: 419: 414: 402: 194:Although the knowledge of 181: 2105: 2079: 2012: 1986: 1957: 1948: 1906: 1835: 1826: 1815: 1772: 1734: 1725: 1707: 1326: 277:Composition of type metal 1180: 565: 560: 555: 550: 548: 375:Type metal compositions 218:Required characteristics 1595:Fry's Metal Foundries, 1371: 1338: 288: 1580: 1560: 1516:, antimony-sulfide (Sb 1510: 496:mechanical typesetting 330: 262:, an antimony sulfide 191: 130: 2045:Golding & Company 1908:Hot metal typesetting 1572: 1556: 1472:Every time they melt 1400: 226:and easily workable, 189: 151:hot metal typesetting 124: 2050:Chandler & Price 1790:Logographic printing 1701:Letterpress printing 1480:to melt it in: This 365:Monotype Corporation 297:, and it is easy to 258:had shown that when 145:used in traditional 141:refers to the metal 129:made from type metal 43:improve this article 1712:History of printing 1661:Mechanick Exercises 1648:Mechanick Exercises 1623:Mechanick Exercises 1476:, they built a new 1392:Mechanick Exercises 545: 376: 343:Antimony (Sb) is a 172:melting temperature 2004:Composition roller 1836:Manual typesetting 1425:: Thus they chuse 1249:Tri-polar mixtures 543: 471:Foundry type alloy 374: 204:Johannes Gutenberg 192: 131: 2136: 2135: 2075: 2074: 1944: 1943: 1931:Intertype Machine 1813: 1812: 1773:Blocks and plates 1178: 1177: 681: 680: 525:in a laboratory. 487: 486: 403:Slugcasting alloy 119: 118: 111: 93: 2161: 2013:Types of presses 1958:Parts of a press 1955: 1954: 1936:Paige Compositor 1926:Ludlow Typograph 1916:Linotype machine 1833: 1832: 1821: 1732: 1731: 1694: 1687: 1680: 1671: 1670: 1664: 1657: 1651: 1644: 1638: 1632: 1626: 1619: 1613: 1606: 1600: 1593: 1415:Printing Letters 806:Lino/Intertype c 784:Lino/Intertype b 762:Lino/Intertype a 686: 685: 546: 542: 437:Stereotype alloy 377: 373: 323:Lead oxide is a 316:but with little 241:, obtained from 114: 107: 103: 100: 94: 92: 51: 27: 19: 2169: 2168: 2164: 2163: 2162: 2160: 2159: 2158: 2139: 2138: 2137: 2132: 2101: 2087:Folding machine 2080:Other equipment 2071: 2008: 1982: 1940: 1921:Monotype system 1902: 1848:Composing stick 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547: 541: 538: 535: 531: 530:United States 526: 524: 520: 515: 511: 509: 505: 501: 497: 479: 476: 473: 469: 462: 459: 456: 452: 445: 442: 439: 435: 428: 425: 422: 418: 411: 408: 405: 401: 397: 392: 387: 382: 379: 378: 372: 370: 366: 355: 353: 348: 346: 336: 328: 326: 321: 319: 315: 311: 306: 304: 300: 296: 286: 283: 274: 272: 267: 265: 261: 257: 253: 251: 246: 244: 240: 236: 231: 229: 225: 215: 213: 209: 205: 201: 197: 188: 179: 177: 173: 168: 164: 160: 156: 152: 148: 144: 140: 136: 128: 123: 113: 110: 102: 91: 88: 84: 81: 77: 74: 70: 67: 63: 60: –  59: 55: 54:Find sources: 48: 44: 38: 37: 32:This article 30: 26: 21: 20: 2109:Related arts 2092:Paper cutter 2067:Rotary press 1805:Zinc etching 1748: 1744:Type casting 1736:Movable type 1726:Ways to make 1660: 1655: 1647: 1642: 1634: 1630: 1622: 1617: 1609: 1604: 1596: 1591: 1575: 1573: 1561: 1557: 1544:child labour 1541: 1537: 1530: 1511: 1505: 1501: 1497: 1493: 1489: 1486:Open Furnace 1485: 1481: 1477: 1473: 1471: 1466: 1462: 1458: 1454: 1450: 1446: 1442: 1438: 1434: 1430: 1426: 1422: 1418: 1414: 1410: 1408: 1403: 1401: 1391: 1388:Joseph Moxon 1386: 1375: 1364: 1352: 1342: 1330: 1313: 1309: 1305: 1293: 1282: 1273: 1270: 1261: 1258: 1255: 1252: 1244: 1237: 1235: 1232: 1223: 1214: 1202: 1195: 1184: 1158:Typefounding 1157: 1135: 1113: 1091: 1069: 1047: 1025: 1003: 981: 959: 937: 915: 893: 871: 850:Stereotyping 849: 828:Stereotyping 827: 805: 783: 761: 739: 717: 707:Remelting at 682: 539: 527: 516: 512: 493: 361: 349: 342: 334: 322: 307: 292: 284: 280: 268: 254: 247: 232: 221: 212:movable type 193: 147:typefounding 138: 132: 105: 99:October 2006 96: 86: 79: 72: 65: 58:"Type metal" 53: 41:Please help 36:verification 33: 2128:Papermaking 2123:Printmaking 2118:Bookbinding 2019:Hand press 1828:Typesetting 1800:Electrotype 1754:Punchcutter 1728:impressions 1548:labor force 657:Catalogues 271:type design 243:cassiterite 2143:Categories 2113:Typography 1994:Offset ink 1780:Stereotype 1749:Type metal 1583:References 1451:stub-Nails 1431:stub-Nails 1427:stub-Nails 1409:The Metal 1171:420...430 1149:340...360 1127:340...360 1105:360...380 1017:360...380 1004:Monotype g 995:370...390 982:Monotype f 973:350...370 960:Monotype e 951:380...400 938:Monotype d 929:360...380 916:Monotype c 907:350...370 894:Monotype b 885:330...350 872:Monotype a 863:320...340 841:320...340 819:300...320 816:270...285 797:300...320 794:270...285 775:300...320 772:270...285 753:300...320 750:270...285 731:310...330 728:280...290 702:Casting at 380:Alloy type 320:strength. 256:Alchemists 139:type metal 69:newspapers 2028:Columbian 1873:Furniture 1843:Type case 1764:Wood type 1404:Of making 1390:, in his 1366:Magnesium 1361:Magnesium 1355:aluminium 1297:oxidation 1205:pollution 1162:5.5/28.5 718:Typograph 712:Hardness 697:Liquid at 504:Intertype 398:Comments 345:metalloid 310:malleable 2154:Printing 2023:Stanhope 1999:Ink ball 1576:Antimony 1568:red wine 1564:antidote 1552:children 1514:stibnite 1494:Antimony 1467:Antimony 1447:Antimony 1443:Iron Run 1411:Founders 1406:Mettal. 1316:eutectic 1289:Monotype 1285:Linotype 1239:eutectic 1227:crystals 1187:crucible 595:Routine 575:Purpose 566:Hardness 532:and the 508:Monotype 500:Linotype 388:Antimony 339:Antimony 260:stibnite 250:antimony 235:pewterer 208:printing 176:eutectic 167:antimony 135:printing 1970:Frisket 1898:Hellbox 1878:Leading 1717:Printer 1533:furnace 1506:Furnace 1482:Furnace 1478:Furnace 1417:of, is 1198:oxidise 986:9.5/17 964:9.5/15 570:Brinell 367:in the 318:tensile 314:ductile 303:letters 196:casting 182:History 83:scholar 2149:Alloys 2033:Albion 1987:Inking 1975:Tympan 1965:Platen 1868:Reglet 1759:Matrix 1608:N.N., 1526:sulfur 1502:Mettal 1498:Making 1474:Mettal 1459:Charge 1332:Copper 1327:Copper 1008:10/16 740:Ludlow 689:Usage 665:12/24 645:13/17 603:10/16 325:poison 312:, and 224:galena 200:moulds 143:alloys 85:  78:  71:  64:  56:  1893:Forme 1888:Chase 1883:Quoin 1863:Strut 1785:Flong 1413:make 1396:nails 1344:Brass 1301:dross 1191:dross 1181:Dross 1174:29.5 1074:9/16 1052:9/12 1030:9/11 998:27.5 954:28.5 942:9/19 920:7/17 898:8/15 876:5/15 854:7/14 832:5/15 810:7/12 800:21.5 788:6/12 766:5/12 744:5/12 722:3/12 709:(°C) 704:(°C) 699:(°C) 692:Sn/Sb 654:29.5 634:28.5 625:9/19 612:27.0 592:23.0 583:6/15 563:(°C) 558:(°C) 551:Sn/Sb 523:assay 494:Most 352:mould 210:with 155:alloy 90:JSTOR 76:books 1858:Slug 1853:Sort 1546:, a 1500:the 1490:Fire 1465:and 1463:Iron 1455:Fire 1439:Iron 1435:Iron 1423:Iron 1419:Lead 1377:Iron 1372:Iron 1348:zinc 1339:Zinc 1287:and 1165:360 1143:280 1140:5/5 1121:295 1118:3/5 1099:310 1096:1/2 1014:370 1011:275 992:380 989:280 970:360 967:270 948:390 945:285 926:370 923:280 904:360 901:260 882:350 879:265 860:315 857:258 838:320 835:265 813:241 791:243 769:245 747:245 725:250 694:(%) 671:240 668:330 651:240 648:283 631:240 628:286 615:Dual 609:240 606:273 589:240 586:261 553:(%) 519:nick 502:and 393:Lead 299:cast 295:work 289:Lead 228:lead 165:and 159:lead 149:and 127:sort 62:news 1979:Bed 1152:16 1130:14 1020:27 976:26 932:26 910:25 888:23 866:23 844:23 822:22 778:21 756:21 734:19 674:33 510:). 395:(%) 390:(%) 385:(%) 383:Tin 331:Tin 264:ore 239:tin 237:'s 163:tin 157:of 133:In 45:by 2145:: 1554:. 1398:. 1318:. 1193:. 1168:— 1146:— 1124:— 1108:6 1102:— 1086:— 1083:— 1080:— 1077:— 1064:— 1061:— 1058:— 1055:— 1042:— 1039:— 1036:— 1033:— 662:5 642:4 622:3 600:2 580:1 572:) 534:UK 480:54 477:28 474:18 463:74 460:16 457:10 446:78 443:15 429:84 426:12 412:86 409:11 252:. 178:. 161:, 137:, 125:A 1693:e 1686:t 1679:v 1522:3 1520:S 1518:2 568:( 440:7 423:4 406:3 112:) 106:( 101:) 97:( 87:· 80:· 73:· 66:· 39:.

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