ON THE HARDNESS OF METALS AND ALLOYS. 121 
Lead and Antimony. 
Formulz of Alloys and per centages. Weight 
employed. 
lbs. 
SL an eee Entered 2-5mm. with 800 
Pb 28°64) lbs.; then broke. 
Bb, Shyla oe. Ce) Nae eat Cae ee Entered 2-7mm. with 800 
Pb 34:86 lbs.; broke with 900 lbs. 
Pb Sb, { Sb e514} eS TERE 875 
Pb Sb, { ae eek TH ada asedOse Be Aipsanechde Entered 2°5mm. with 500 
. Pb 61-61 lbs.; broke with 600 lbs. 
BSB Fae or) bovdi Sh cote 500 
Pb 76°32 
ae Ea ee 385 
Pb 82:80) 
oe ed 310 
Pb 86°52 
Sb Pb, {Sp ie. 48} pee, 300 
Pb 88°92 
Sb Pb, { au 08 Meas 295 
Lead and Tin. 
Weight Obtained Calculated 
Formulz of Alloys and per centages, employed. Dest Cast 7 
Pb 26° ‘oF 
lbs. 
200 41°67 
105 40°62 
Pb 36:99 
Sn 63°01 160 32°33 
125 26°04 
100 20°83 
125 26°04 
135 28°12 
125 26°04 
110 22°92 
We have great pleasure in thanking here Mr. Siméon 
Stoikowitsch, F.C.S., for his valuable assistance during 
these long researches. 
VOL, XV. R 
