# The Dictionary Of Photography

### A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

 Weighing and Measuring Avoirdupois Weight. 16 drachms......... = 16 ounces ... ... ... = I lb. = 16 ozs. = 256 drms. = 7,000 grs. by all (dealers for retailing chemicals, etc. Liquid Measure. 60 minims ... ... ... = 8 drachms ... ... ... = 20 ounces ... ,.. ... = 8 pints ......... = i ounce, i pound. (This weight is used I oz. = 437-5 grs.). 1 gal. (Cj) = 8 pts. (Oviij) = 160 ozs. (f. 3, 160) = 1,280 fluid drachms (f. 5, 1,280). The following is a synopsis of the Metric System of weights and measures : - Lineal Measure. 1,000 millimetres ioo centimetres 10 decimetres 10 metres ioo .. 1,000 ,, 1 metre. 1 M 1 r, 1 decametre. 1 hectometre. 1 kilometre. The metre is the unit, and is equal to 3937 English inches, and was intended to be equal to a 40-millionth part of a meridian circle. Liquid Measure. 1,000 millilitres 100 centilitres 10 decilitres 10 litres 100 .. 1,000 ,, The litre is the unit, and is equal to 35216 fluid 1 litre. 1 M 1 M 1 decalitre. 1 hectolitre 1 kilolitre. Liquid measures are often expressed, however, as cubic centimetres, or ccm.; = i6'8 minims: but as the statutory measure is now the very slightly different millilitre it is better when practicable to adopt this (see Cubic Centimetre). 648