164 



Projection Apparatus and Accessories. 



No. 50 801 - 



50 805 A. 1:9. 



50 805 B. 1:9. 



frame for taking photographs of 9x10.5 cm, 8.5x10 cm and 9x12 cm plate-size; 1 Stage and 

 1 Slider with stand for taking the change frame, the stage or other objects. 



For Switchboards, Regulating Resistances, see pp. 1226 1228. For Transformers and Twin Flexible Cables, 

 see p. 169. 



Better optical and other Fittings, see Nos. 50,750 50,767 on p. 161: 



The housing is of blacked sheet brass and has a door and an observation window on each of the two sides. 

 The distribution of light is somewhat enhanced by the oblique arrangement of the lamp. The arc lamp can also 

 be brought into a vertical position for carrying out spectrum experiments. The tilted type of lamp is not prac- 

 ticable for alternating current. 



The illustration Fig. 50,805 A shows the apparatus as employed for projecting photographs, and 

 Fig. 50,805 B as used for projecting apparatus. 



Projection Lantern with tilted Lamp (Schuckert system), Fig. 50,808, with auto-regulating Direct 

 Current Arc Lamp for 20 amps., for projecting Photographs; with Condenser and Projection 

 Objective, and with 2 interchangeable water troughs; Change Frame with small frame inserted 

 for 8.5x10, 9x10.5 and 9x12 cm. 



We also supply these projectors with 1 trough constructed entirely of glass for filling with a solution of 

 ferrous ammonium oxide, which absorbs the heat excellently, in lieu of the two water troughs. The price is 

 the same. 



One of the regulating resistances Nos. 9645 9648, p. 1228, is necessary for working the lantern and should 

 be ordered at the same time. In addition to this, it is advisable to have the switchboard No. 9621. 



The foregoing lanterns if fitted with an alternating instead of direct current lamp are increased in price 

 by 1. 15. 0. The A. C. lamps can only be used in the vertical position. 



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Cl. 229, 2291. 



