COLLKCllONS IN KCONOMIC (J IK >),(»( ;Y ANH .Ml", lA l.l.T K(; V. 1 H9 



A sorifs »»l ;illn_\s niaiiuraclmrd li\ Mr. I';iiil S. l;»'f\cs, I'lnlailrl 

 pliiii, Pennsylvania, incluilos a lull scrirs of KaUbitt iii«-tals. Hotiio 

 bronzes and brass. 



llilbbiti or uiili/rirtiiin iiirttilx. 



(1) Gni.i.' \XX, goniiiii.'. (SniUO.) (C.) (JraW.' C (55<)45.) 



(■J) (Jriulf XX, coiipoiliiinlt'iiiii;;. (f^'iCMl.) (7) (iratle I>. ^">^>^^4^'>. ) 



(:{) <«rii(l«> X, oopjMT liarih'uiiin. {7t')C)i2.) (8) fJradf K. (r>r>(')47.) 



(4)t;radt'A. (r)r)(i43.) t'.») <Jra.l.^ F. (r>r.(J4H.) 

 (;.) Grade B. (r.r><;44.^ 



liriiiizen. 



(I) Giiii-iiiotal bronze, composition nine i>arts copper, one jtart tin. (^K)Ct49.) 



(•J) Jonrnal-iuotal bronze, compo.sition seven |»art9 copper, oii« part tin. (55650.) 



(:{) Roman bronze, for journal bearings. (5565'i. ) 



(4) Roman bronze, for puuip rods, cojj wheels, etc. (r)5<>53.) 



Jirass. 



(I) Composition three parts copper, one part ziuc. (55651.) 



A special alloy made i)arti('nlarly for bearinjisand resistance to chem- 

 ical lliiids, coiitainiiijLj; copper, tin, and lead, ami known as Ajax metal, 

 is illnstrated by two specimens, r)0*.>20 and 50921. 



An alloy of tin and ])bospliorus for preparing^ j)liosplior bronze; 

 known as Scandia pbospliortin, is illustrated by 44300, 



Type Metal. 



The manufacture of type and type metal is fully illustrated by a col- 

 lection contributed by Messrs. MacKellar, Smiths & Jordan, of IMiila- 

 delphia, Pennsylvania; iucludinj; the metals use<l, the ditfereut jjrades 

 of type metals and the stei)s in the castinjjj process. 



(1) Lead, for making type-metal alloy. (51'J14.) 



(2) Antimony, for making type-metal alloy. (51215.) 

 (W) Tin, for making typti-nietal alloy. (51216.) 



(4) Copper, fur making the matrix for casting the letter of the type. (51217.) 



(5) Script type metal. (51218.) 



(6) Hard type metal. (51219.) 



(7) Soft type metal. (51220.) 

 (d) Electrotype metal. 51221.) 



(9) I>ie, for forming the letter in the matrix. (51222.) 

 (10) Matrii, with liie letter punched in it. (5122:1.) 



(II) Matrix, justified, ready to be u.sed to cast the letter of the type. (51224.) 

 (12) Type, as ca-st, two s]iecimens. (51225.) 



(III) Finished type, a series of m in seventeen sizes. (7>122ri. ) 



(14) Defective and mfiise type. (51227.) 



(15) Ringtail mold and ladle, as u^cd in casting type by hand over loO years ago. 

 (51228.) 



(U)) Improved lever moid, forctsling by hand, intrcMluced 1^11. (51221*.) 

 (17) Maciiiiie moid, bejtig the casting Jtart of the intricate machine use«l at pres- 

 ent in casting type. .\n .\iuerican invention intro(hice<l in l"^i;{, .ind since greatly 

 improved. (512;10.) 



