Ch. II] 



DAYLIGHT GLASS 



51 



and for the incandes- 

 cent, nitrogen-filled, 

 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 

 under 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- 

 cilities 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- 



Fig. 37. Lantern for Daylight Glass in 

 Section x \. 



(From the Anatomical Record, June, 1916). 



1 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; iV the 100-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 by A, B. 



a Daylight glass in the apertures of the lantern. 

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

 / Lugs to hold the daylight glass in position; .1 

 the partition containing the lamp socket seen from 



below, v Ventilating slits. » Nuts at the ends of 



the bolts holding the metal damp for the lamp 

 socket; B Hot torn 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. (.1, B, are only about I natural 

 size.) 



