. 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. 151 quite fall or nearly empty, the light is perfectly uniform, which is not the case with the Cambridge lamp before men- tioned, unless it be constructed upon the plan of Mr. Spencer, described in page 157. The author for many years has used a emaU French fountain lamp, fig. 107; it has an exceedingly small wick, always burns well, and gives an excellent light, and the consumption of oil being
. 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. 151 quite fall or nearly empty, the light is perfectly uniform, which is not the case with the Cambridge lamp before men- tioned, unless it be constructed upon the plan of Mr. Spencer, described in page 157. The author for many years has used a emaU French fountain lamp, fig. 107; it has an exceedingly small wick, always burns well, and gives an excellent light, and the consumption of oil being small, it is advantageous in an econo- mical point of view. There are many other little contrivances in this French lamp, which deserve a separate description. The stem does not pass through the reservoir, as in the Cam- bridge lamp, but through a square piece of brass having two holes, one on either side of that through which the stem passes; these holes commu- nicate with the reservoir, and the oU flows through them into the tube supporting the burner. By this ar- rangement the reservoir is placed on one side of the stem and the burner on the other, and the two balance each other. The gallery supporting the chimney is provided with ten fin-like pieces of soft brass, about three-quarters of an inch in length; these stand up in a circle and press against the sides of the chimney and keep it steady; they can be bent either inwards or outwards to fit any chimney that wiU go into the lower part of the gallery. The cup at the bottom of the burner, to hold the superfluous oil, is ingeniously furnished with a funnel-shaped mouth just above the screw, by which it is attached to the burner; the funnel receives aU the oil that runs down the outside of the burner, and in it are two holes by which the oil may escape into the cup. This contrivance prevents the oil from flowing over the outside of the cup, which by these means is kept clean. Some French lamps have a rack and pinion for rai
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
