Chemical and pharmaceutic manipulations; a manual of the mechanical and chemico-mechanical operations of the laboratory ... For the use of chemists, druggists, teachers and students

 
9781234280079: Chemical and pharmaceutic manipulations; a manual of the mechanical and chemico-mechanical operations of the laboratory ... For the use of chemists, druggists, teachers and students

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 edition. Excerpt: ...be sealed in the flame of a spirit lamp. The means of heating these small vessels, are the small spirit lamps Figs. 118, 116, except when it is required to modify the heat by a sand-bath, which requires a larger lamp. The clamp supports p. 176, heretofore described, are of very great convenience in the adjustment of these tube arrangements. A simpler form of tube retort is shown in Fig. 202. It is readily made by closing a tube at one end and bending it in a zigzag direction as represented in the drawing. The liquid to be distilled is at a and the recipient at b. To render it Fig. 202. Fig. 203. applicable to the generation and collection of gases, the tube may be drawn out at its open end and bent downwards if necessary to reach the receiver. Platinum Retorts.--The size of these vessels varies from a quart down to an ounce, these capacities being adapted to all the purposes of an analytic and pharmaceutic laboratory. The usual form is shown in Fig. 203. The body a is nothing more than a stout crucible with a thick rim d. The head b, with the helm c, should be hammered from one piece or else very closely welded together, and it should be ground at its rim so as to fit perfectly to the mouth of the still. Platinum stills are very useful for destructive distillation, for determining the amount of matter, if any, lost by substances at a red heat, for the distillation of matters not readily volatilized, of those which corrode glass, &c., and consequently, as a substitute for lead in the preparation of fluohydric acid. Those of a large size should be fitted with handles so as to diminish their liability to defacement by transfer from place to place. When heated over charcoal, they should be well payed over with an external coating of fire...

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