558 NEGEETTI AND ZAMBRA, HOLBORN VIADUCT, E.C., 



A Russian Verst or Werst is 500 Sachines, or 3,500 English Feet, or 0*6629 Miles. 



A German or Saxony Post-meile is 24,000 Fuss = 7,432 English yards, or 4*277 Miles. 



Milan and Venice (New Decimal System of 1803). 1 Miglio = 1000 Metri, or 1,093-63 



Yards, or 0-6214 Mile English. 

 Siam. 1 Vouah = 6-306 feet English, and the Roeneng = 2,000 Vouahs, or 12,612 Feet, 



or 2-3886 Miles English. 

 Argentine Vara, 34-10381 English Inches. 

 A Knot, or Nautical Mile, 6,082 feet. 

 An English Ordinary Mile, 5,280 feet, or 1760 yards. 

 A Geographical Mile, 6,080 feet. 



1 Cubic foot of Fresh water weighs 62-425 Ibs. = '557 cwt., or 0*028 of a ton. 

 1 Cubic foot of Sea water weighs 64'11 Ibs. = -572 cwt., or 0-0286 of a ton. 

 1 Cubic inch of water weighs 0-03612 Ibs. 

 1 Cubic foot of water contains 6-24 gallons. 

 1 Cubic foot contains 1728 Cubic inches. 



1 Ton of water contains 35'9 cubic feet or approximately 1 cubic metre. 

 1 Foot in head gives a pressure of 0'4335 Ib. per square inch. 



1 Inch of rain collected by an 8-inch circular gauge, = 29 oz. and 18 grains Weight 

 12-inch circular gauge, 58 oz. 36 grains. 



Inches of rainfall multiplied by 2323200 gives cubic feet per square mile. 

 Ditto ditto by 14500000 gives gallons per square mile. 



Ditto ditto by 3630 gives cubic feet per acre. 



1 Inch rainfall is approximately 100 tons 9 cwt. per acre. 



TABLE SHOWING THE REDUCTION OF 

 GRAMMES INTO GRAINS. 



TABLE SHOWING THE REDUCTION OF CUBIC 

 CENTIMETRES INTO MINIMS. 



The gramme is the French unit of weight. 

 A Troy ounce is equal to 31-103 grammes. 

 An Avoirdupois ounce = 28-356 grammes. 



A cubic centimetre is the unit of French 

 liquid measure ; 1,000 cubic centimetres being 

 equal to 1 litre, or 1-76 pint = 35 fluid 

 ounces. A cubic centimetre of water measures 

 nearly 17 minims : it weighs 1 gramme, or 

 15*4 grains. 



A cubic inch is equal to 16-386 cubic 

 centimetres, a gallon = 4*543 litres. 



