286 



APPENDIX. 



at London, is the standard for the British measures. One 

 mile is equal to 1,618.833 such pendulums. 



WEIGHTS. 



The standard of weights, is, the cubic inch of distilled 

 water, weighing 253.458 Troy grains ; the Troy pound, 

 5,760 grains, or 22.8157 inches. The same standard of 

 7,000 Troy grains, makes the pound avoirdupois, 27.7274 

 cubic inches ; ten of which, or 277.274, being the impe- 

 rial gallon, or a quart 69.32 ; and a gill of five ounces of 

 water, equal to 8.664. 



The American quintal is 100 pounds. 



The weight of a cubic inch of distilled water, in a vac- 

 uum, is 252,722 grains, and in air, is 252.458 grains. 



The Tarkish pound is 7,578 grains ; the Danish, 6,941 ; 

 the Irish, 7,774; the Neapolitan, 4,952; the Scotch, pound 

 Troy, 7,620.8. 



A cubic foot of loose earth or sand weighs 95 pounds. 



A cubic foot of common soil weighs 124 pounds. 



MEASURES OF CAPACITY. 



Measure is length, breadth, and thickness, estimated by 

 known lengths, or compared by other known quantities ; 

 thus, there are 12X12X12=1,728 cubic inches in a cu- 

 bic foot, and 3X3X3=27 cubic feet in a cubic yard. 



The imperial gallon is 277.274 cubic inches. A gill, or 

 quarter of a pint, is 8| inches. 



The imperial gallon contains 10 lbs. avoirdupois, of dis- 



