NIGHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

144

Square Measure.

sq. inches = 1 sq foot 40 perches

sq. feet = 1 sq yard 4 roods

sq yards = 1 sq. rod, sq. pole 4840 sq. yards
or perch 640 acres

= I rood
= 1 acre
= 1 acre
= 1 sq. mile

Cubic or Solid Measure

1728 cubic

27 „

40 „

35 „

36 „
40 to 43

100 „

4 gills = 1 pint
2 pints = 1 quart
4 quarts = 1 gallon
36 gallons = 1 barrel
6J gallons
10 pounds
224 gallons

inches = I cubic foot

feet = 1 cubic yard

feet = 1 shipping ton merchandise

feet = 1 ton sea water

feet = 1 ton fresh water

feet = 1 ton coal

feet = 1 ton register (ships)

Liquid Measure.

54 gallons = 1 hogshead = 1J- barrels

72 gallons = 1 puncheon = 2 barrels

108 gallons = 1 butt = 3 barrels

• 1 cubic foot fresh water = 62 J Ibs.
: 1 gallon fresh water
= 1 ton fresh water

1 cubic foot sea water = 64 Ibs.

2 pints
4 quarts
2 gallons

60 seconds
60 minutes
24 hoiirs

Dry Measure.

1 quart 4 pecks 1 gallon 8 bushels 1 peck 5 quarters
= 1 bushel = 1 quarter = 1 load

Measures of Time.
1 minute 23h. 56m. 4s.

1 hour 365 days

1 solar day 366 days

— 1 sidereal day

= 1 year

= 1 leap year

Angular Measure.
60 seconds ("} = 1 minute 360 degrees (°) =1 circle
60 minutes (') — 1 degree 180 degrees (°) = -nr = 3-1416r
90 degrees (°) = 1 quadrant
Circumference of the earth = 24,855 miles (approx.)
Diameter of the earth = 7900 miles (approX)