School Projection Apparatus. 



161 



50778. 1:11. 



employed for other kinds of illumination by schools in which electricity is not available for the purpose. When 

 arranging for installing electricity it is only necessary therefore to order an electric arc lamp for the lantern 

 afterwards. 



The lantern is also supplied resting on short legs, in accordance with Fig. 50,778 and the following table. 

 When constructed thus it has an extending bellow, rendering it peculiarly adapted for the projection of dia- 

 positives. The bellows can, however, easily be removed, and the lantern then be used for all other modee of 

 projection. 



Other Optical Fittings and Accessories. 



I 



= 



I 



A 

 U 



O 



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When one of the better objectives listed in the above table is ordered at the extra price given, the Pro- 

 jection Objective is, of course, omitted. 



School Projection Apparatus, Model A, low Type (F i g. 50,778), with detachable extending bellows, 

 achromatic Objective, Optical Bench, change frame with small frame for taking diapositives 

 9x10.5 cm, 8.5x10 cm, and 9x12 cm; 1 Stage and 1 Slider with stand for inserting the change 

 frame, the stage or other objects. 



Re the Construction of this lantern, kindly note the description of the preceding model; for better optical 

 and other fittings, see above, Nos. 50,750 50,767. 



Cl. 5367. 



11 



