The ferrotype and how to make it - The Grian Press

THE FERROTYPE.
>A/'EIGHTS AND MEASURES.
Apothecakies' Weight.—soiiiD MEAStnaE.
20 grains = 1 scruple = 20 grains.
3 scruples = 1 drachm = 60 "
8 drachms = 1 ounce = 480 "
12 ounces = 1 pound = 5760 "
FLUID. SYMBOL.
60 minims = 1 fluid drachm, f. 3
8 drachms = 1 ounce. f.
20 ounces = 1 pint. O. 5
8 pints = 1 gallon. gall.
The above weights are those usually adopted in formubs.
All Chemicals are usually sold by
Avoirdupois Weight.
37^^ grains = 1 drachm = 27i| grains.
16 drachms = 1 ounce = 437J "
16 ounces = 1 pound = 7000 "
Precious Metals are usually sold by
Troy Weight.
24 grains = 1 pennyweight = 24 grains.
20 pennyweights = 1 ounce = 480 "
12 ounces == 1 pound = 5760 "
Note.—An ounce of metallic silver contains 480 grains, but an onvM
of nitrate of silver contains only 437>^ grains.
French Weights and Measures,
AND their equivalents IN ENGLISH.
1 cubic centimetre = 17 minims, nearly.
3| « " ^1 drachm.
28*4 " " =1 ounce.
50 " " =1 ounce 6 drachms 5 minims.
100 " " = 3 ounces 4 drachms 9 minims,
or 1 litre,
V = 35 ounces 1 dracnm 36 minima
:= to 61 cubic inches. J
The nnit of French liquid measures is a cubic centimetre. A cubic cenHmetre
of water measures nearly K minims (16896) j it weighs 154 grains, or
1 grnmme. A cubic inch of water weighs 25rs grains.
„^„. . , .. „. .
The unit of French weights is the gramme. - to 15 4 grains, tbna a
drachm (6(1 grains) is nearly 4 grammes (3ti8). An easy ^ajr to convert
gi amines into Kglish weight, is to divide the sum by 4, which giVM tiM
e«iaivalent in drachms very nearly thus:
OBAMMES. DBACHMg. OZ. DKCHH. GRAINS.
100 -J- 4 = 25 = 3 . 1 4- 43.