28 HOW TO SEE WITH THE MICROSCOPE. 



cut off any portion of the collar that may project 

 beneath said stage. 



In the stage thus far towards completion, it so be 

 that the collar projects one-sixteenth of an inch, this 

 will be found ample for its support ; thus you will be 

 enabled with some stands to steer clear of sub-stage 

 appliances, etc. 



All that remains to be done is to fit your new stage 

 with plain spring-clips, which can be done in a few 

 moments out of a piece of watch-spring; or, if there is 

 room enough, you can provide an object-carrier, made 

 on Mr. Zentmayer's principle; all of which is plain 

 work, and easily accomplished by any machinist of toler- 

 able skill. 



Keep in mind that this stage adds somewhat to the 

 thickness, and govern yourself accordingly. 



" But," says one, " I have no assurance that this stage 

 will rotate in the optical axis." I grant it, with the 

 remark that if it did so rotate with one objective, it 

 would be pretty sure to fail with another. The com- 

 pensation must be supplied by finger manipulations, 

 easily acquired, and as easily practiced. As I have 

 previously hinted, the best rotating stages remain con- 

 centric but fora short time, especially if much used; 

 while to the real worker, the very bother of adjusting 

 the most expensive stage extant would be an intolerable 

 annoyance, and a willful waste of time. 



A grand good thing about this improvised stage is, 

 that it can be placed in position or removed therefrom 

 in a moment's time. This, to the author, is a real boon, 



