highley's microscope. 



99 



at a level a little below that of the stage. In the centre 

 of the foot is placed the mirror, which moves in an arc 

 of brass ; that, in its turn, works upon a pivot in the foot 

 of the ' instrument. This handy microscope, with three 

 powers and mahogany case, is sold at thirty-five shillings. 



Fig. 54. — Highley's Professional Microscope. 



Highley's Professional Microscope, shown in fig. 54, is 

 a useful and well-made instrument, mounted on a tripod, 

 with coarse and fine adjustment, mechanical stage, &c. 

 The mode in which the body is supported is very good 

 in principle, and the milled-heads for the coarse adjust- 

 ment are in a position which is easily reached by the left- 

 hand when the elbow is resting on the table, whilst the 

 right-hand finds the milled-heads of the traversing stage, 

 &c. It is arranged for a secondary stage, and all the 

 necessary apparatus to make a complete instrument. Al- 

 though the tripod is a very good form for a microscope, 

 it requires all the solidity and metal of a Powell and 

 Lealand, or it will not remain (without clamping) perfectly 

 steady and well balanced when j)laced in the horizontal 



h2 



