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Fahrenheit, Réaumur, and the Centigrade Scales.
CNT. FAHR. RMR. CNT. FAHR. RMR. CNT. FAHR. RMR. CNT. FAHR. RMR.
60 140 48
Zero Fahrenheit corresponds with minus 17'78 Centigrade, and minus 14'22 Réaumur.
I cubic ft. of water = 624lb.
1 cubic ft. of sea water = 64lb. 6 gallons.
A column of water 12 inches high, rin. square ='434lb.
1 cylindrical foot 49 gallons='49lb.
An inch rainfall = 14 million gallons per square mile.
IMMERSION IN SALT AND FRESH WATER.
To find the difference of immersion or draught in salt and fresh water. If from salt to fresh, multiply the draught of salt water by 36, and divide the product by 35. If from fresh to salt, multiply the draught of fresh water by 35 and divide the product by 36.
Example :-Required the draught of a vessel in fresh water when drawing 20ft in salt water: 20ft x 36 720 ÷ 35ft. = 20 5 in.
Table of draughts worked out by the above formula :
The Southern Ocean below Cape Horn reaches a depth of 5,500 yards, and off Cape of Good Hope, 5,700 yards. The average depth of the Bay of Biscay is 1,200 yards.
BEAUFORT NOTATION, FORMULA, AS USED FOR INDICATING THE DISTURBANCE OF THE SEA.
1 Very Smooth.
5 Rather Rough.
8 Very High.
SHOWING THE LENGTH OF EACH DEGREE OF LATITUDE IN STATUTE MILES
Length of one Degree in Statute Miles.
To find the height at which a Light should be put above the sea level to show a given number of miles :
Multiply the number of miles by itself, and by 4, and divide
Should be 55 feet high above the sea level.