.] 



NEW-YORK MICROSCOPICAL SOCIETY. 



Society held January loth, had exhibited a microscope furnished 

 with electrical illumination. I again conferred with Mr. Miiller; 

 and I now have lamps, manufactured by him, which suit my 

 purpose. Illustrated at A, Fig. i, is a small lamp; at C, a larger 

 one.^ Each consists of a glass globe, at the exact centre of 

 which is a horse-shoe carbon supported by two platinum wires. 

 The wires terminate outside the globe, in the eyes f and e. 

 The neck of the lamp A is forced into the spiral spring B, and 

 connection is made with the hooks f^ and e^ . The spring 

 presses the lamp upward and thus brings about an intimate con- 

 tact of the eyes/ and e with the hooks/^ and e^. These hooks 



I. 



communicate with two conducting wires m and n, which are let 

 into a hard-rubber screw. The screw itself is attached to the 

 extremity of a jointed arm articulating with the microscope as 

 shown in Fig. 2. To bring a lamp of the smaller size to a brill- 

 iant white heat, a current from two Bunsen or Grove elements 

 20 cm. high, is sufficient. The lamp C, Fig. i, having a larger 

 carbon, will require three elements. Should a stronger light in 

 any direction be required, a part of the globe, as seen at d, Fig. 

 I, may be silvered on the outside so as to act as a reflector. For 

 lamps to be used with low-power objectives, opal glass is pref- 

 erable to common glass, as the light through it is less fatiguing 

 to the eye. 



* All the cuts illustrating this article are copied from the " Zeitschrift fiir Wissen- 

 schaftliche Mikroskopie." 



