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SCIENCE- GOSSIP. 



THE KAMMATOG-RAPH. 



"T" AST month we drew attention to this remark- 

 -*~^ able invention, by which the use of the long 

 tape celluloid film is avoided during the exhibition 

 of moving pictures. Those who have exhibited 



rapidity. Fig. 2 shows the extreme simplicity of 

 Mr. Kamm's invention, which has the advantage 

 of a minimum of parts, so that it is almost im- 

 possible for the mechanism to become disorganised. 



THE KAiDlATOGEAPH. 



Fig. 1. Section of Subject Plate. 



with that type of film are familiar with the anxieties 

 that arise during its rapid rim past the lantern 

 lens. Mr. Kamm some time ago realised this 

 difficulty, and consequently set to work to design 

 an instrument through which the use of the tape is 

 dispensed with, by printing the pictures in spiral 

 form ,upon a circular glass plate or disc. Fig. 1 

 shows a section of this spiral. 



s» 



Having conceived this idea, it became necessary 

 to design certain mechanical movements enabling 

 the operator to revolve this plate in such a manner 

 as to exhibit every picture in sequence and with 



Fig. 3 exhibits the instrument closed and ready 

 for operation, its dimensions being 14 inches high, 

 13J inches broadband 3^ inches in width, the total 

 weight being no more than 8 lbs. 



Of course it is necessary to have a lantern for 

 exhibiting the pictures, and fig. 4 represents the 

 arrangement of the kammatograph placed ready 

 for work in front of the lantern. These lanterns are 



designed by Mr. Kamm for use with a small electric 

 arc lamp, though other sources of light may be 

 used, accessories for these purposes being avail- 

 able. 



