556 



NEGRETTI AND ZAMBEA, HOLBORN VIADUCT, E.G., 



CARAT. Diamonds and Pearls are weighed by the" Carat, which contains 4 grains ; bnt 

 5 Diamond grains are only equal to 4 Troy grains ; the ounce Troy containing 150 Diamond 

 Carats. 



The Imperial Pound Troy, made in the year 1758, is that from which all other weights 

 are obtained ; T V of it is the Troy ounce, V is a penny weight.'and ^ of the pennyweight is 

 a grain, so that 5760 grains is a Pound Troy (12 Troy ounces) and 7000 such grains is a 

 pound Avoirdupois, the grain in each case being identical. 



WEIGHTS AND MEASURES. 



480-0 grains Troy = 1 oz. Troy. I 5760-0 grains Troy = 1 Ib. Troy. 



437*5 grains Troy = 1 oz. Avoirdupois. I 7000*0 grains Troy = 1 Ib. Avoirdupois. 



MEASURES 



Millimetre = 0-03937 inch. 

 Centimetre = 0-39371 inch. 

 Inch = 2*5399 centimetres. 



OF LENGTH. 



Decimetre = 3-93708 inch. 

 Metre == 39-37079 inch. 

 | Foot = 3-0479 decimetres. 



MEASURES OF SURFACE. 

 Square ifich = 6'4513 square centimetres. | Square foot = 9-2899 square decimetres. 



MEASURES OF CAPACITY. 



Cubic centimetre = 0'0610 cubic inch. I Litre, or ) 61-0270 cubic inch. 



Ditto, ditto = '00176 pint. Cubic Decimetre i or 1-760 pint. 



Cubic inch = 16-3861 cubic centimetres. I Gallon = 4*5434 litres. 



Milligramme = 0'0154 grains. 



Centigramme = 0'1543 grains. 



Decigramme = 1-5432 grains. 



Grain = 0-0647 grammes. 



MEASURES OF WEIGHT. 



Gramme = 15'4323 grains. 

 Kilogramme = 15432'3488 grains. 



Troy oz. = 31 '1034 grammes. 



TABLE FOR REDUCING ENGLISH FEET TO FRENCH METRES, 

 AND FRENCH METRES TO ENGLISH FEET. 



1 French Metre = 3-2808992 English Feet. 



