Megadiascope. 



1219 



Fig. 28. No. 9510. 1 :15. 



E 



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with adjustable plane mirror, condenser 150 mm. in diameter, column fitted with ra?k and pinion, projection s. d. 

 objective 53 mm. in diameter, with tilting erecting prism silvered on the front in metal mount; also with 

 Megascope for projecting book illustrations, drawings and flat opaque objects by means of reflected light, 

 having first quality illuminating mirror in metal mount, diaphragms, adjustable object stage and pressing 

 device for firmly clamping the books, drawings, etc., erecting mirror silvered on the front, in wood mount 

 with cover, a Voigtlander Heliarof 24o mm. focal length and 54 mm. aperture ( 13), fine focussing being 

 ired by rack and pinion. 



In the Megascope, periodicals, etc., up to 36 x 26 cm. high and across can be placed and from 

 all parts of this surface illustrations can be projected by the Megascope, even though the illustrations 

 be not in the centre of the page. 



If a water service Ls not at hand 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 mimr 

 they are then changed for a freshly filled trough. The extra price for these troughs is 1. 10. 0. 



9505. The foregoing Megadiascope. but with auto-regulating Arc Lamp for 30 or 50 ampei 



with Standard Optical Outfit Size 1 73.0.0 



For prices of the Megadiascope with other Optical Outfits, see Table on p. 1220. 



Megadiascope, small Model, 25--30 amperes Direct Current. 



9510. Kohl's Megadiascope (German Design), small Model, F i g. 28, with Arc Lamp for 

 25 30 amperes Direct Current, with Hand Regulation, for Diapositives up to 

 13 18 cm. and opaque illustrations up to 9 10 ' ., cm. with Horizontal Projection 



> i- 



/ 



Apparatus and Megascope, together with standard Optical Outfit Size 1. Price, exclusive 



of Table or Regulating Resistance 51. 0. 



For prices of the Megadiascope with other Optical Outfits, see Table on p. 1220. 



This Megadiascope comprises projector arc lamp, with hand regulation, for 25 30 amperes Direct 

 Current; parabolic mirror 200 mm. in diameter; condenser 122 mm. in diameter; achromatic projection 

 objective 43 mm. in diameter and 120 mm. focal length with rack and pinion focussing; continuous- 

 cooling water trough, with cock, arranged for filling with a solution of ferrous ammonium sulphate; ad- 

 justable stage on slider; objective carrier on slider: extensible optical bench with supporting upright: 

 diapositive change-frame for size 9 x 10 1 ... cm.; oak house with dark glass peep-holes and curtains: 

 tilting device with screw for the superstructure of the house: metal projector chamber with air circulation, 

 doors with peep-glasses, with double-pole switch, wood tongs and key for the carbons: also with a Hori- 

 zontal Projection Apparatus, Fig. 6. with first-quality plane mirror, condenser 155mm. in diameter, 

 pillar with rack and pinion, projection objective 53 mm. in diameter, with tilting erecting mirror silvered 

 on the front side, in metal mount with cover; The apparatus also includes a Megascope (F i g. 26) for 



Cl. 5223. 



