92 THE MICROSCOPE. 



Mr. Pillischer (New Bond Street) is favourably known 

 for the excellency of his instruments. His No. 1 Micro- 

 scope (fig. 47) is of good workmanship, and somewhat 

 novel in design. It is constructed on a plan which may 

 be described as intermediate between that of Smith and 

 Beck and Ross's well-known pattern, and in point of 

 finish is quite equal to the microscopes of the first- 

 mentioned manufacturers. The bent form given to the 

 arm carrying the body gives increased strength and soli- 

 dity to the instrument, although it is doubtful whether 

 it adds to its steadiness when placed in the horizontal 

 position. The straight body rests for a great part of its 

 length upon a straight bar of solid brass, ploughed into 

 a groove for the reception of the rack which is attached 

 to the body, the groove being of such a form that the rack 

 is held firmly while it glides smoothly through it. This 

 is so firm, and gives such a steady uniform motion, as 

 almost to render the fine adjustment unnecessary. The 

 fine adjustment screw is removed from the usual position 

 and placed in front of the body, just above and in front 

 of the Wenham prism. The binocular bodies are inclined 

 at a smaller angle to one another than in most makers, 

 which, with the range of motion given to the eye-pieces 

 by the rack and pinion, enables observers whose eyes 

 differ greatly in separation to use the instrument with 

 equal facility. The prism is so well set that it illuminates 

 both fields with equal intensity. The stage is provided 

 with rectangular traversing movements to the extent of 

 an inch and a quarter in each direction. The niilled-heads 

 which effect these are placed on the same axis, instead of 

 side by side, one of them the vertical one being re- 

 peated on the left of the stage, so that the movements 

 may be communicated either by the right hand alone or 

 by both hands acting in concert. The stage-plate has the 

 ordinary vertical and rotatory motions, but to a much 

 greater extent than usual ; and the platform which carries 

 the object is provided with a spring clip to secure the 

 object when the stage is placed in the vertical position. 

 A regularly fitted sub-stage with centering screws is made 

 in the usual way to carry an achromatic condenser, dia- 

 phragm, polarising, and other apparatus in short, no 



