Ch. II] 



DAYLIGHT GLASS 



SI 



and for the incandes- 

 cent, nitrogen^fiUed, 

 tungsten (mazda) 

 lamp. It may be said 

 in passing that these 

 glass filters whiten any- 

 artificial light, but that 

 true, daylight color 

 values are given only 

 imder the precise con- 

 ditions for which the 

 glass was worked out. 

 It is also gratifying to 

 note that this success- 

 ful solution of a long 

 vexing problem came 

 only when the rigid 

 training in physics and 

 chemistry and the fa- 

 cihties of a great man- 

 ufacturing plant were 

 brought together. 



In the practical use 

 of these daylight fil- 

 ters it was found by 

 me that the surface 

 should be finely ground 

 (frosted), or white 

 frosted glass should 

 be used with it. Then 

 the light should be en- 

 closed in some form of 

 lantern to cut off all 

 unfiltered light, and 

 the daylight glass 

 placed opposite the fil- 



— 2 



Fig. 37. 

 (From the Anatomical Record, June, 1916). 



Lantern for Daylight Glass in 

 Section x i. 



I, top of the lantern supporting the lamp. It 

 sets down on the lower part like the cover of a pail. 

 V Ventilating slits. The tin from these slits is 

 turned up at right angles; sc the porcelain socket 

 with key switch, and the asbestos insulated cable 

 for the current; N the loo-watt nitrogen-filled 

 mazda lamp; w The flat warming plate on the top 

 of the cover. It is a brass plate about three milli- 

 meters thick. The temperature on this plate is 

 about 40 to 45° C. and serves for spreading paraffin 

 sections, etc. 2 The lower part of the lantern con- 

 taining the daylight glass. It is square in cross- 

 section, as shown hy A, B. 



a Daylight glass in the apertures of the lantern. 

 The pieces of glass are about 5 cm. in diameter. 

 I Lugs to hold the daylight glass in position; A 

 the partition containing the lamp socket seen from 

 below. V Ventilating slits, n Nuts at the ends of 

 the bolts holding the metal clamp for the lamp 

 socket; B Bottom of the lantern. It is about 15 

 mm. from the table, thus permitting an intake space 

 for air. Paraffin infiltration can be done here if 

 one is careful. {A, B, are only about ^ natural 

 size.) 



