Antimony..............

1053

Aluminum: Castings.....

15000

Sheet........

24000

Bars........

28000

Brass: Yellow...........

26880

Bronze: Cast: Lunkenheimer.......

34000

Delta metal:

Cast..........

44800

Rolled......

67200

Gun-metal......

32000

Phosphor.......

40000

Manganese......

62720

Tobin..........

78500

Copper: Cast...........

22400

Sheet..........

30240

Wire...........

40000

Cast Steel: Lunkenheimer..........

80000

Gold...................

20384

Average Tensile Strength of Materials in Pounds per

Square Inch - Continued

Iron: Cast:............

18000

Lunkenheimer..............

25000

Wrought..........

45000

Lead: Cast.............

1800

Rolled Sheet......

3320

Platinum Wire..........

53000

"Puddled" Semisteel:

Lunkenheimer 35000 to 42000

Silver: Cast.....

40000

Steel: Cast.....

60000

to

80000

Forgings..

60000

to

95000

Tin: Cast......

3360

Zinc: Cast......

3360

Sheet....

15680

Woods

Ash............

11000

to

17000

Beech..........

11500

to

18000

Cedar..........

10300

to

11400

Chestnut.......

10500

Elm...........

13000

to

13489

Hemlock.......

8700

Hickory.......

12800

to

18000

Locust.........

20500

to

24800

Maple..........

10500

to

10584

Oak: White.....

10253

to

19500

Pine: White

10000

to

12000

Pine: Yellow. ...

12600

to

19200

Spruce.........

10000

to

19500

Walnut: Black.

9286

to

16000

In designing a piece of machinery, the first thing to find out is the strength of the metal or material of which it is to be made. The technical meaning of "strength" is the power of a body to resist force and in mechanics the word "body" means any solid object. The word "force" means a push, a pull, a twist, or a cut.