. Annals of Philosophy. 1818.] Triple Prussiate of Potash. 109 This tube is plunged into the mercurial trough; and the gas extricated during the application of the heat is collected in glass jars. The bulk of this gas being ascertained, a quantity of caustic potash is let up into it. This absorbs the carbonic acid gas. The residual gas in the present case, is azote. The increase of weight in the muriate of lime gives the quantity of water evolved. In making this experiment, easy as it may seem, some precautions are to be taken in order to ensure accuracy. I found that the results did not corre
. Annals of Philosophy. 1818.] Triple Prussiate of Potash. 109 This tube is plunged into the mercurial trough; and the gas extricated during the application of the heat is collected in glass jars. The bulk of this gas being ascertained, a quantity of caustic potash is let up into it. This absorbs the carbonic acid gas. The residual gas in the present case, is azote. The increase of weight in the muriate of lime gives the quantity of water evolved. In making this experiment, easy as it may seem, some precautions are to be taken in order to ensure accuracy. I found that the results did not correspond well with each other, unless the peroxide of copper be at least 20 times the weight of the triple salt. I usually mixed 120 grains of peroxide of copper with five grains of the triple salt. The salt was in its usual crystallized state. I reduced it to a fine powder, and mixed it intimately with the peroxide of copper. Glass tubes are liable to melt if the heat employed be a little too great. I found experiments made with them rather tedious and uncertain. I, therefore, got a solid copper rod of the requisite diameter bored into a tube. It was a foot long. The mixture of peroxide of copper and triple salt filled six inches of it. The remaining six inches I filled with peroxide of copper. To keep the per- oxide from being driven out of the tube, or mixing with the muriate of lime in the glass tube, I filled up the end of the copper tube with amianthus. To the extremity of the copper tube was luted with fat lute a glass tube, bent as in the margin. That portion of it which is marked with dots was filled with dry powdered muriate of lime. The whole upper part of it and the lower extremity was filled with amianthus. After being accurately weighed, it was luted to the copper tube. The copper tube was placed in a small chauffer, and so poised that about eight inches of it were within the chauffer, the remaining four inches were without. This exteriorportion was covered with a th
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