Conversations on chemistry : in which the elements of that science are familiarly explained and illustrated by experiments : to which are now added explanations of the text, questions for exercise, directions for simplifying the apparatus and a vocabulary of terms, together with a list of interesting experiments . m of a vegetation,whence it has obtained the name of flowers of apparatus, which is called an alembic, is highly usefulin all kinds of distillations, as you will see when we come totreat of those operations. Alembics are not commonly madeof glass, like this, which is app
Conversations on chemistry : in which the elements of that science are familiarly explained and illustrated by experiments : to which are now added explanations of the text, questions for exercise, directions for simplifying the apparatus and a vocabulary of terms, together with a list of interesting experiments . m of a vegetation,whence it has obtained the name of flowers of apparatus, which is called an alembic, is highly usefulin all kinds of distillations, as you will see when we come totreat of those operations. Alembics are not commonly madeof glass, like this, which is applicable only to distillationsupon a very small scale. Those used in manufactures aregenerally made of copper, and are of^course considerablylarger. The general construction, however, is always thesame, although their shape admits of some variation. Caroline. What is the use of that neck, or tube, whichbends down from the upper piece of the apparatus ? Mrs. B. It is of no use in sublimations ; but in distillations(the general object of which is to evaporate, by heat, inclosed vessels, the volatile parts of a compound body, and tocondense them again into a liquid,) it serves to carry off thecondensed fluid, which otherwise would fall back into the cu-curbit. But this is rather foreign to our present SULPHUR. 125 Let us return to the sulphur. You now perfectly understandI suppose, what is meant by sublimation ? Emily. 1 believe I do. Sublimation appears to consist indestroying, by means of heat, the attraction of aggregationof the particles of a solid body, which are thus volatilized ;and as soon as they lose the caloric which produced thateffect, they are deposited in the form of a tine powder. Caroline. It seems to me to be somewhat similar to thetransformation of water into vapour, which returns to its li-quid state when deprived of caloric. Emily. There is this difference, however, that the sul-phur does not return to its former state, since, instead oflumps, it chan
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