744 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Btage being capable of focusing up and down to an extent of 2 in. 

 The body is 2 in. in diameter, and a photographic lens maybe placed in 



the centre for photographing large objects, with a rack-and-pinion dra„ 

 tube and sliding draw-tube, which as well as the nose-piece, are removable. 



aw- 



