. Elements of chemistry ... n, lead being lighter than quicksilver, if abullet of the former be sunk in a vessel of the latter, it willrise to the surface. On this principle balloons ascend ; thehydrogen with which they are charged being 13 timeslighter than the atmosphere, the former is forced upwardsby the pressure of the latter. 254. A lamp furnace, Fig. 48, isone of the most indispensable ar-ticles in a chemical apparatus. Itconsists of a rod of brass, or iron,about half an inch in diameter,and three or four feet long,screwed to a foot of the samemetal, or to a heavy piece ofwood. On this
. Elements of chemistry ... n, lead being lighter than quicksilver, if abullet of the former be sunk in a vessel of the latter, it willrise to the surface. On this principle balloons ascend ; thehydrogen with which they are charged being 13 timeslighter than the atmosphere, the former is forced upwardsby the pressure of the latter. 254. A lamp furnace, Fig. 48, isone of the most indispensable ar-ticles in a chemical apparatus. Itconsists of a rod of brass, or iron,about half an inch in diameter,and three or four feet long,screwed to a foot of the samemetal, or to a heavy piece ofwood. On this rod, slide threeor four metallic sockets, intowhich are screwed straight armsterminated with brass or ironrings of different diameters. Thescrews cut on the ends of thearms where they enter the socketsare all of the same size, so thatthe rings may be changed fromone socket to another, as con-venience requires. These ringsare for the support of retorts, re-ceivers, evaporating dishes, &c,as represented in the figure, and. When air is introduced under a vessel, inverted and filled with water, whydoes it rise to the highest part of the vessel ? How does the rise of a balloonillustrate this principle? Describe the lamp furnace, Fig. 48. What are theuses of the rings on the ends of the arms ? What are the uses of the thumbscrews with which the sockets and lamp are furnished ? 120 CHEMICAL APPARATUS. may be moved up, or down, or turned aside, and then fixed intheir places, by means of thumb screws passing throughthe sockets and acting on the rod. The lamp by whichthe heat is given for distillation, or other purposes, is alsofixed with a thumb screw, so that the heat can be regulatedby moving it up or down. 255. A bell glass receiver, Fig. 49, is employedin making experiments on air, or the gases. Fig. is a glass vessel, of the shape representedin the figure, and of various sizes, from thecapacity of a pint to that of several knob at the upper part, is the handle byw
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