II.—Tin, 10 parts; lead, 5 parts; melting point, 365° F.
III.—Tin, 10 parts; lead, 6 parts; melting point, 374° F. {665}
IV.—Tin, 10 parts; lead, 10 parts; melting point, 392° F.
V.—Tin, 10 parts; lead, 15 parts; melting point, 432° F.
VI.—Tin, 10 parts; lead, 20 parts; melting point, 464° F.
The last of the above mixtures is the cheapest, on account of the large quantity of lead.
Bismuth solder or pewterer’s solder fusible at a low temperature is prepared by melting together:
I.—Tin, 2 parts; lead, 1 part; bismuth, 1 part; melting point, 266° F.
II.—Tin, 3 parts; lead, 4 parts; bismuth, 2 parts; melting point, 297° F.
III.—Tin, 2 parts; lead, 2 parts; bismuth, 1 part; melting point, 320° F.