Ch. II] ARTIFICIAL LIGHT FOR THE MICROSCOPE 



55 



This lamp illumination is brilliant, but the color values are quite 

 unlike those given by daylight. 



§ 97. Lighting with artificial daylight. — For the source of light 

 use preferably a 75 or 100 watt nitrogen-filled mazda lamp enclosed 



Fig. 38. Laboratory Table, Stool, Microscope, and Daylight Lan- 

 tern, x 1/15. 



(From the Anatomical Record, June, 1916). 



M Microscope; N Nitrogen-filled mazda lamp of 100 watts; a Aper- 

 ture for the daylight glass. This is about 5 cm. in diameter. The arched 

 covering at the top is open on one side only, at the right in this figure. It will 

 be noted that the table rail is cut out in front to avoid interference with the 

 legs of the observer, and the table drawer is at the right and can be pulled out 

 without moving. The seat is a revolving, adjustable piano stool. 



in a kind of lantern (fig. 37-38). Have the lamp filament at about 

 the level of the center of the microscope mirror, and a frosted disc 

 of daylight glass, before an aperture in the lantern. The aperture 

 for the daylight glass should be from 5 to 10 cm. in diameter. For 

 all high powers the small size is sufficient. For objectives of 50 to 



