1220 



Megadiascope. 



Fig. 29. No. 9515. 1 : 10. 



. s. d. 



projecting book illustrations, drawings and flat opaque objects by reflected light; with first-quality illumi- 

 nating mirror in metal mount; a Voigtlander Heliar of 240 mm. focal length and 54 mm. aperture ( 13), 

 fine focussing of the objective being secured by rack and pinion. 



If a water service is not available for cooling the trough, we can supply two interchangeable 

 troughs mounted on castors. These absorb about 1 C. of heat per minute and can thus be used for 

 30 minutes, after which they must be changed by a freshly filled trough. Extra price 1. 10. 0. 



9515. The foregoing Megadiascope but with automatically regulating Arc Lamp for 25 amperes 



Direct Current and with the Standard Optical Outfit Size 1, Fig. 29 (see also F i g. 31) 55. 10. 



Prices of the Megadiascopes with various Optical Outfits. 

 Large Model, 30 50 amperes Direct Current. 



p 



X 



o 



sr 



Q 



3 



s 



VJ 



Small Model, 25 30 amperes Direct Current. 



') For data relative to the size of the image on the screen when employing the various optical outfits, and 

 at various distances between Megadiascope and screen, see Table p. 1204. 



Cl. 



