162 



Projection Apparatus and Accessories. 



No. r>u 7s: 1 , 



50794. 1:9. 



50 795. 1 : 



Projection Apparatus, Model B, with Aluminium House (Figs. 50,794, 50,795, 50,796, for projecting 

 apparatus and photographs; with Condenser, Achromatic Objective, Optical Bench, Change 

 Frame with small frame for taking photographs 9x10.5 cm, 8.5x10 cm, and 9x12 cm plate- 

 size; 1 Stage and 1 Slider with stand for holding the change frame, the stage, or other objects, 

 on tall legs. 



For Series Resistances, Transformers and Twin Flexible Cable, see p. 168. For better optical and other 

 fittings see Nos. 50,750 50,767, p. 161. 



This projector is somewhat more richly fitted out than Model A. The lamp housing is composed of alu- 

 minium walls, is well ventilated and has two doors with dark glass peep holes. The provision of the doors (one 

 in the side wall and the other in the back wall) renders it convenient to insert the carbons. The arc lamp can 

 be raised and lowered by a handle and screw so as to get the centre of light quickly and accurately in the 

 oplical axis. One of the side walls of the housing carries a switch for the arc lamp (where the lanterns are 

 fitted with arc lamps); the switch is thoroughly enclosed thus obviating any contact being made in the dark with 

 parts under current. 



The hand regulator fitted in the case of Nos. 50,783, 50,789 and 50,795 is manipulated by simply turning 

 the hand wheel fitted above it; this form of regulation is very convenient. 



For localities not yet supplied with electric current, but where this supply is contemplated, the lantern 



Cl. 3275, 3268. 



