| 24 | Sheets (sh.) make | 1 Quire (qu.) |
| 20 | Quires make | 1 Ream (r.) |
| 10 | Reams make | 1 Bale (ba.) or bundle. |
[p. 183]
TABLE OF TEMPERATURES.
| Greatest artificial cold | 220 | degrees | below | Fahr. |
| “ natural “ | 39 | “ | “ | “ |
| Mercury freezes | 73.7 | “ | “ | “ |
| Mixture of snow and salt | 4 | “ | “ | “ |
| Greatest density of water at | 39.2 | “ | above | “ |
| Blood Heat | 97.9 | “ | “ | “ |
| Alcohol boils | 172.4 | “ | “ | “ |
| Water boils | 212 | “ | “ | “ |
| Mercury boils | 662 | “ | “ | “ |
| Sulphur boils | 824 | “ | “ | “ |
| Silver melts | 1,749 | “ | “ | “ |
| Cast iron melts | 2,786 | “ | “ | “ |
STRENGTH OF VARIOUS METALS.
The tests are made by using a cubic inch of the metal and compressing it, and by trying to draw apart a square inch of metal. Indicated in pounds
[p. 184]
| | Tension | Compression |
| | | |
| Aluminum | 15,000 | 12,000 |
| Brass, cast | 24,000 | 30,000 |
| Bronze, gun metal | 32,000 | 20,000 |
| “ manganese | 60,000 | 120,000 |
| “ phosphor | 50,000 | . . . . . . |
| Copper, cast | 24,000 | 40,000 |
| “ wire annealed | 36,000 | . . . . . . |
| “ unannealed | 60,000 | . . . . . . |
| Iron, cast | 15,000 | . . . . . . |
| “ “ annealed | 60,000 | 80,000 |
| “ “ unannealed | 80,000 | . . . . . . |
| “ wrought | 48,000 | 46,000 |
| Lead, cast | 2,000 | . . . . . . |
| Steel castings | 70,000 | 70,000 |
| “ plow | 270,000 | . . . . . . |
| “ structural | 60,000 | 60,000 |
| “ wire annealed | 80,000 | . . . . . . |
| “ crucible | 180,000 | . . . . . . |
| Tin | 3,800 | 6,000 |
| | | |
[p. 185]
FREEZING MIXTURES