. The microscope and its revelations. ws on to the rod and bruises it. This lamp, ifmade, as it should be, with a japanned tin reservoir and a cast-iron tripod foot, is quite inexpensive. There is no justificationfor a circular foot, except that it can be readily and well finishedin the lathe with better apparent results and less labour than otherforms. A small lamp is made by Messrs. R. and J. Beck. We illus-trate it in. fig. 342. The base, A, consists of a heavy ring, into which a square brass 1 It is very important to remove the metal chimney after use, or at least not toleave it on when no
. The microscope and its revelations. ws on to the rod and bruises it. This lamp, ifmade, as it should be, with a japanned tin reservoir and a cast-iron tripod foot, is quite inexpensive. There is no justificationfor a circular foot, except that it can be readily and well finishedin the lathe with better apparent results and less labour than otherforms. A small lamp is made by Messrs. R. and J. Beck. We illus-trate it in. fig. 342. The base, A, consists of a heavy ring, into which a square brass 1 It is very important to remove the metal chimney after use, or at least not toleave it on when not in use, since the evaporating paraffin gathers round it and causesundesirable scent when the lamp is again lit. The thinnest slips should be used. 406 MANIPULATION AND PRESERVATION OF THE MICROSCOPE rod, ]>. is screwed. The square rod carries a socket, 0, with an arm,D, to which the lamp is attached. On each side of the burner, and attached to the arm, I), is anupright rod, G, to one of which the chimney is fixed, independent of. reservoir of the lamp, thus enabling the observer to revolve theni-r and reservoir, and cither the edge or the flat side ofthe Maine without altering the posilion of the chimney. Thechimney, I1, is made of thin l»ra». witli t\\ openings opposite toother, into \\hich slide 3x1 glass slips of either white, blue, or LAMP WITH LATERAL MOTION 407 opal glass, the latter serving as a reflector ; but we do not considerthe reflexion here accomplished as other than an error; it causesdouble reflexion and confuses the condensed image. A semicircle swings from the two uprights, C4, to which it isattached by the pins, H, placed level with the middle of the flame ;to this semicircle is fixed a dovetailed bar. L. carrying a slidingfitting, O, which bears a Herschel bulls-eye. P. This is complex,in id therefore costly. The bulls-eye is fixed at any inclination by a milled head workingin a. slotted piece of brass, K,fixed to the arm, D. For use with the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
