Excerpt from The Weighing and Measuring of Chemical Substances

The subjects dealt with in this book will be limited to the weighing and measuring methods suitable for use in the chemical works. We shall entirely omit any reference to the finer forms of weighing and measuring instruments such as are employed in the laboratory. Furthermore, we shall concern ourselves with the instruments and methods, and leave the choice of system, metric or otherwise, to the user.

As far as is possible we have endeavoured to confine our attention to the general mechanical principles and theoretical considerations which apply to the various types of instruments described. In nearly all cases there are many makers of each kind of apparatus. Details as to size, etc., can be obtained by consulting their trade catalogues.

Materials naturally fall into the three classes: Gases, Liquids, and Solids. Gases will not be dealt with here, but will receive separate and special attention in another number of this series.

Both solids and liquids can be dealt with either by weight or volume, although in the case of solids measurement by volume tends to be inaccurate, particularly where the material is of uneven size.

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