Principles of naval engineering - Historic Naval Ships Association

-PRINCIPLES OF NAVAL ENGINEERINGTable 7-5. —Selected British-Metric and Metric -British Conversions,TYPE OFMECHANICALUNITBRITISH-METRIC CONVERSIONSMETRIC -BRITISH CONVERSIONSLENGTH 1 inch = 2. 540 centimeters1 foot = 0. 3048 meter1 yard = 0.9144 meter1 mile = 1.6093 kilometers1 mile = 1609. 3 meters1 centimeter = 0. 3937 inch1 meter = 39. 37 inches1 kilometer = 0.62137 mileAREA 1 in. 6. 452 cm1 ft =2929 cm1yd" 0.8361 m21 mi^ = 2. 59 km100 mm = 0. 15499 in,100 cm^ =^15.499 in,100 m^ = 119,6 yd^1 km 0. 386 miVOLUME1 in,'1 ftlyd^16, 387 cm0,0283 m^0,7646 m^1000 mm^ = 0.06102 ^ in.1000 cm^ = 61.02 ^in.1 m^ = 35.314 ft^231 in.'3, 7853 liters1 liter = 1. 0567 liquid quartsWEIGHT 1 grain = 0.0648 gram1 ounce = 23. 3495 grams1 piound = 453. 592 grams1 pound = 0.4536 kilograms1 gram1 gram1 gram1 kilogram15.4324 grains0.03527 ounce0. 002205 pound2. 2046 poundsUnited States standard kilogram mass is keptat the National Bureau of Standards.The standard of mass is kept in a vault. Notmore than once a year, the standard is removedfrom the vault and used for checking the valuesof smaller standards. The United States standardkilogram mass has been taken to Francetwice in the last seven years for comparisonwith the international standard. Every precautionis taken to keep the kilogram standard massin perfect condition, free of nicks, scratches,and corrosion. The standard is always handledwith forceps; it is never touched by humanhands.When the national standard is compared ona precision balance with high precision copies,the copies are found to be accurate to withinone part in 100 million.TimeBefore 1960, the standard of time was themean solar second—that is, 1/86,400 of a meansolar day, as determined by successive appearancesof the sun overhead, averaged over ayear. In 1960, the standard of time was changedto the tropical year 1900, which is the time ittook the sun to move from a designated point126