Accessory Apparatus 109 



and Son, and modifications of it can be obtained from most 

 dealers. 



A similar model of lamp which has rack-work and sliding 

 adjustments in the vertical direction, and a quick acting 

 screw for lateral adjustments, is also obtainable. Its 

 mechanical arrangements enable the light from the lamp 



FIG. 41. ELECTRIC MICROSCOPIC LAMP. 



to be shifted just the slight amount that is often needed, 

 and obviate the necessity for moving the lamp itself, as 

 would otherwise have to be done. 



Electric Lamps. The increasing use of electric light has 

 caused some attention to be given to this form of illuminant 

 for microscopical work. Figure 41 shows a very handy 

 pattern that can be connected to the ordinary house 



