The photographer's note-book and constant companion : containing 250 practical hints, formulae, expedients, etc., etc. (1897)
Lambert, F. C. (Frederick Charles) compiler · London : Hazell, Watson, & Viney Ld., 1, Creed Lane, Ludgate Hill · leaf 68
of being easily powdered, e.g., gum, etc., and for certain reasons we do not wish to apply heat to assist solution. The apparatus indicated in the annexed sketch is easy to make, and very useful for the purpose in question. It may very well be made out of the half of a rather wide test-tube (or a… … a holder for the tube. The sub- stance to be dissolved (in conveniently small pieces) is now placed at the bottom of the tube. This is then lowered into the dissolving fluid contained in another vessel, e.g., a tumbler, so that its surface is just level with the upper part of the solid to be…
