APPENDIX. 



USEFUL DATA FOR HYDRAULIC CALCULATIONS. 



Multiplier for converting logarithms : 



I Common to hyperbolic (to base e) 2'30258. 

 (Hyperbolic to common "43429. 



One radian = 57'296. 

 g = 32-1908 at Greenwich. 



One knot = 6,080 feet per hour. 

 One metre = 39*37 inches = 3'28 feet. 



Standard atmosphere = 29'95 inches = 760 millimetres of mercury 

 = 33-9 feet of water. 

 = 14'7 Ibs. per square inch. 



Inches of mercury X '4907 = Ibs. per square inch. 

 Feet of water X '4331 = Ibs. per square inch. 



A pressure of 1 Ib. per square inch is equivalent to a column of water 

 2-309 feet high = 27'7 inches high. 



One imperial gallon = '1605 cubic feet. 



= 277*27 cubic inches. 



= 10 Ibs. 

 One U.S. gallon = 231 cubic inches. 



= '83254 imperial gallons. 

 One cubic foot of fresh water = 62 -4 Ibs. 

 One cubic metre of fresh water = 35'32 cubic feet = 2,200 Ibs. 

 One litre of fresh water = 2*2 Ibs. 



One ton of fresh water = 35*9 cubic feet. 



One cubic foot of sea water = 64*0 Ibs. 

 H.A. 3 F 



