inches in the tube S, connected with the first bottle, nine inches in that belonging to thesecond, six inches in the third, and three in the last; wherefore these tubes must be madesomewhat more than twelve, nine, six, and three inches long respectively, allowancebeing made for oscillatory motions, which often take place in the liquids. It is sometimesnecessary to introduce a similar tube between the retort and recipient; and, as the tube isnot immersed in fluid at its lower extremity, until some has collected in the progress ofthe distillation, its upper end must be shut at first with a little lute, so as to be openedaccording to necessity, or after there is sufficient liquid in the recipient to secure itslower extremity.This apparatus cannot be used in very accurate experiments, when the substancesintended to be operated upon have a very rapid action upon each other, or when one ofthem can only be introduced in small successive portions, as in such as produce violenteffervescence when mixed together. In such cases, we employ a tubulated retort A, Pl.VII. Fig. 1. into which one of the substances is introduced, preferring always the solidbody, if any such is to be treated, we then lute to the opening of the retort a bent tube[Pg 394][Pg 395][Pg 396]
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three inches, eight ounces, Mr Lavoisier, caput mortuum, Mr Hassenfratz., three inches