Page 27 - My FlipBook

MEASURING LIQUIDS BY DROPS. 25

A tablespoon of powder (approximate measurement) contains
two drachms.
A teaspoon of powder (approximate measurement) contains
one-half drachm.
One drop of water (small drop, approximate measurement)
contains one minim.
One drop of essential oils (approximate measurement) contains
one-half minim.
A graduated measure-glass is the most accurate measure, as
spoons, glasses, etc., vary greatly in size.

MEASURING LIQUIDS BY DROPS.
In measuring liquids by drops, a glass medicine-dropper should
be used, as the uncertainty of dropping from various shaped bot-
tles should not be depended upon.
The following list shows the relative differences between
drops and minims of a few of the drugs used in dental practice.
Number of Drops in Sixty Minims-
Carbolic Acid in Oil Cloves 130
Sulphuric Acid 128 Oil Cinnamon 126
Sulphuric Acid (dilute) .... 60 Oil Wintergreen 125
Aromatic Sulphuric Acid . . . 146 Oil Peppermint 129
Ether 172 Oil Sassafras 133
Alcohol 146 Oil Turpentine 136
Alcohol (dilute) 137 Aromatic Spts. of Ammonia . . 142
Aqua Destillatae 60 Spts. Camphor 143
Aqua Ammonia ...... 64 Syrups 65
Chloroform (purified) .... 250 Tinct. Aconite 146
Creosote 122 Tinct. Benzoin (Comp.) .... 148
Fl. Extract of Ergot 133 Tinct. Digitalis 128
Glycerine 67 Tinct. Chloride of Iron . . . .150
Liq. Chloride of Zinc .... 89 Tinct. Opii 13°
Oil Cajeput 134 Vinum Opii loo
FINENESS OF POWDER.

The fineness of powder is denoted either by descriptive words
(as in the case of brittle and easily-pulverizable substances), or in
terms expressing the number of meshes to a linear inch in the