hhd.)

PAPER MEASURE.

24 Sheets (sh.) make 1 Quire (qu.)
20 Quires make 1 Ream (r.)
10 Reams make 1 Bale (ba.) or bundle.

TABLE OF TEMPERATURES.

Greatest artificial cold 220 degrees below Fahr.
" natural " 73.7 " " "
Mercury freezes 39 " " "
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.

========================+=========+=============
| 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
------------------------+---------+-------------

FREEZING MIXTURES

===============================================+=======================
|Temperature Changes
|in Degrees Fahrenheit
+---------+------------
Mixtures | From | To
-----------------------------------------------+---