THE MICEOSCOPE. 



37 



with a double stage movement, a diaphragm, and a disc or dark 

 well for opaque objects, when to be viewed by a Lieberkuhn. 

 It was supported on three flat feet, capable of being shut up 



Fig. 21. 

 one within the other, for convenience of package ; from these 

 a short but stout piUar rose, having at its upper part a cradle 

 joint, to which was attached the. stage, :;;, and the arm, a, 

 supporting the compound body, h, consisting of three 

 tubes, one within the other. Into the inner tube, i, called 

 the draw tube, the eye-piece, Ji, was screwed; this tube 

 was capable of being drawn out from the middle one for the 

 space of four or five inches, and had engraved on it a scale of 

 inches and parts, and to its lower end an erecting glass could 

 be adapted. To the middle tube was attached a rack, which, 

 with its tube, was moved by a pinion connected with the 



