Chapter XXI: Appendix: L

SOME USEFUL ALLOYS

Name of Alloy Parts Parts Parts Parts Parts
of of of of of
Copper Tin Zinc Lead Other
Metals
--------------+--------+--------+--------+--------+--------------
Gun Metal | 91 | 9 | | |
Bell Metal | 75 | 25 | | |
Phosphor | | | | |
Bronze | 92½ | 7 | | | ½ phosphorus
Aluminum | | | | |
Bronze | 90 | | | | 10 aluminum
Common | | | | |
Brass | 66⅔ | | 33⅓ | |
Brazing Metal | | | | |
(soft) | 50 | 12½ | 37½ | |
German | | | | |
Silver | 60 | | 20 | | 20 nickel
Common | | | | |
Solder | | 50 | | 50 |
Fine Solder | | 66⅔ | | 33⅓ |
Babbitt Metal | 3 | 89 | | | 8 antimony
Pewter | | 80 | | 20 |
Type Metal | | | | 80 | 20 antimony
Aluminum | | | | |
Solder | 95 | | | | 5 bismuth
--------------+--------+--------+--------+--------+--------------

Magnetic Alloy.--An alloy that has strong magnetic properties
is made of 25 parts of manganese, 14 parts of
aluminum and 61 parts of copper, yet none of
these metals are even slightly magnetic.

APPENDIX M

SOME HARD SOLDERS

Hard solders melt only at red heat and are used for soldering gold, silver, brass and other metals where a good strong joint is needed.

-----------+--------+--------+--------+--------+------------
Metal to be|Parts of|Parts of|Parts of|Parts of| Parts of
Soldered | Gold | Brass |Silver | Zinc |Other Metals
-----------+--------+--------+--------+--------+------------
Gold | 66.67 | | 22.22 | |11.11 copper
Silver | | 43.75 | 50 | 6.25 |
Brass | | 87.5 | | 12.5 |
-----------+--------+--------+--------+--------+------------

APPENDIX N

HIGH SPEED STEEL

A special steel alloy which is largely used for turning tools in _engine lathes_ and which will cut ordinary steel when the latter is revolved at a high surface velocity is called _high speed steel_. A tool made of high speed steel will not lose its _temper_ and will keep its cutting edge hour after hour if they are kept cool by a stream of water running on them. A good high speed steel for machine tools is known by the trade name of _blue-chip_ and is manufactured by the Firth-Sterling Steel Company of Pittsburg, Pa.