501 Of ENGINEERING FORMULÆ.
Sundry Measures.
A stone = 14 lbs.
B score = 20.
C gross = 12 dozen.
D quire = 24 sheets.
E ream = 20 quires.
A cord of wood = 128 cube feet
A seam of glass = 120 lbs.
A faggot of steel = 120 lbs.
A ton of coal = 10 sacks.
A ton of Portland cement = 10 sacks or 6 casks.
A barrel of tar = 25 gallons. .
A ton of freight by measurement = 40 cubic
feet.
Size of Drawing Paper.
Inches.
. , . 20 by 15
. . . 22 „ 17
. .. 24 „ 19
. . . 27 „ 19
. .. 30 „ 22
. . • 34 „ 23
Inches.
Atlas__________34 by 26
Double Elephant 40 „ 27
Antiquarian .. 52 ,, 3 J
Tracing paper .. 30 „ 21
.. 30 „ 40
’ -.60 „ 40
Demy ..
Medium
Royal ..
Super-royal
Imperial
Columbier
Tracing cloth, 18,28,36, 38, and 41 inches wide; 24 yards long.
Continuous cartridge, 54 and 60 inches wide.
Casks. (J. T. Hurst.)
D, d = inside diameters at the heads.
M — ditto at the bung, and L = the length, all
in inches; then
The capacity in imperial gallons
= -0014162 L (Dd+M2).
The Buoyancy in lbs. equals ten times the
capacity in gallons minus the weight of the cask
itself.