. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ACCESSORY INSTRUMENTS. 155 the lamp repeatedly rinsed with warm water until it is suffi- ciently clean, which is known by the water coming out quite pure; some boiling water may now be poured in and allowed to remain for a few minutes to thoroughly warm every part; it must then be poured out, and the lamp turned upside down and kept near a fire until it is dry, when it is fit for use again. Care must, however, be tak
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ACCESSORY INSTRUMENTS. 155 the lamp repeatedly rinsed with warm water until it is suffi- ciently clean, which is known by the water coming out quite pure; some boiling water may now be poured in and allowed to remain for a few minutes to thoroughly warm every part; it must then be poured out, and the lamp turned upside down and kept near a fire until it is dry, when it is fit for use again. Care must, however, be taken not to allow the potash to run over on the outside of any part of the lamp, as it wiU destroy whatever bronze or paint it comes in contact with. When the lamp is required to be used immediately after cleaning, turpentine or camphine may be employed with great advantage: it readily dissolves the old oil, and even if a small quantity has been left in, it wiU mix readily with new oil, and aU the trouble of the potash and hot water will be avoided. Portable Candle Lamp.—Mr. Jackson, to whom we are in- debted for so many improvements in the mechanical arrange- ments of the microscope, employs as a substitute for a lamp a candle lamp of the following construction:—a, fig. 108, repre- sents a brass foot about three inches in diameter, into which is screwed a tube, b, about six inches long and one in diameter. Within this slides a smaller tube, that is provided with a cylinder of wax, which is pressed on by a spiral spring, like a Pal- mer's candle; the upper part of this inner tube is seen at d, it has fastened to it a disc of brass, having a rim on its outer edge to support the chimney, c, which is kept firmly in its place by a thin circular ring of brass, having three notches in its outer margin; these fit under three wedged-shaped pieces of metal on the edge of the disc, and pre- vent the chimney from falling off. The cylinder of wax is not provided with a wick, but a short
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