12 inches

=

1 foot.

3 feet

=

1 yard.

16 1/2, feet

=

5 1/2 yards = 1 rod, or pole, or perch.

660 feet

=

220 yards = 40 rods= 1 furlong.

5280 feet

=

1760 yards = 320 rods = 8 furlongs = 1 mile (land).

6 feet

=

1 fathom.

720 feet

=

120 fathoms = 1 cable's length.

6086,37 feet

=

2028,79 yards = 1,1527 land miles = 1 knot or sea-mile.

SQUARE MEASURE.

144 square inches

=

1 square foot.

100 square feet

=

1 square.

9 square feet

=

1 square yard.

272i square feet

=

30 1/2 square yards = 1 square rod.

10890 square feet

=

1210 square yards = 40 square rods = l rood.

43560 square feet

=

4840 square yards = 160 square rods = 4 roods = 1 acre.

27878400 square feet

=

3097600 square yards =102400 square rods = 2560 roods = 640 acres = 1 square mile.

1 acre

=

208,71 feet square = 69,57 yards square = 220 feet x 198 feet.

SOLID MEASURE.

1728 cubic inches

=

1 cubic foot = 2S,31Gl litres.

27 cubic feet

=

1 cubic yard = 764,534 litres.

1 cubic inch

=

0,0005787 cubic feet = 0,01638663 litres.

1 litre

=

1 cubic decimetre = 61,0254 cubic inches.

1 perch of stonework

=

24,75 cubic feet.

LIQUID MEASURE.

(U. S. standard.)

1gill

=

7,21875 cubic inches.

4 gills

=

1 pint = 28,875 cubic inches.

8 gills

=

2 pints = 1 quartzz57,75 cubic inches.

32 gills

=

8 pints = 4 quarts = 1 gallon = 231 cubic inches = 0,133G8 cubic feet.

1 cubic foot= 7,48052 gallons (approximately 7 1/2 gallons).

1 gallon of water weighs = 8,33888 pounds.

63 gallons = 1 hogshead.

1 gallon = 1,405 litres.

AVOIRDUPOIS (COMMERCIAL) WEIGHT.

16 drams

=

1 ounce (oz.).

16 ounces

=

1 pound (lb.).

14 pounds

=

1 stone.

28 pounds

=

1 quarter.

112 pounds

=

1 hundredweight (cwts.).

2240 pounds

=

20 cwts. = l ton (gross or long).

2010 pounds

=

1 short ton (used in this work).

27,34375 troy grains

=

1 dram avoirdupois.

1 troy pound

=

0,822857 avoirdupois pound =12 troy ounces = 210 troy pennyweights = 5760 troy grains.

1 avoirdupois pound

=

1,215278 troy pound.

Table XXIX. Classification Of Structural Irons And Steels

Table XXIX Classification Of Structural Irons And  200170