1880.] 



MICROSCOPICAL JOUKNAL. 



2ua 



The new ''Acme" Microscope. 



Messrs. John W. Sidle vfe Co., of 

 Lancaster, 

 Pa . , already 

 well-known as 

 the manufac- 

 turers of the 

 small "Acme'" 

 stand, which 

 is now design- 

 ated as "No. 

 3," have just 

 perfected a 

 larger stand, 

 the "Acme 

 Ko. 2," a cut 

 of which is 

 now present- 

 ed to microscopists 

 for the first time. 

 The small " Acme," 

 which was the result 

 of the combined 

 knowledge and skill 

 of Professor J. E. 

 Smith and Mr. Sidle, 

 rapidly became a fa- 

 vorite with micro- 

 scopists, and has had, 

 we believe, a large 

 sale already. The 

 larger stand is more 

 complete, as may be 

 seen from the 

 illustration. 

 The descrip- , 

 tion which is 

 here given ap- 

 plies to the 

 binocular, but 

 holds good for 

 the monocu- 

 lar also. 



The stand is entirely of brass, 

 highly finished, and stands about 

 17 inches high when in use. The 

 bodies are of full length, 9^ in- 

 ches from the lower end of the 

 nose-piece to the upper end of 

 draw-tube ; thus, with length of 



lens-mounting, giving the standard 

 length of ten inches. The fine 

 adjustment moves the entire arm, 

 and with it the bodies. The 

 fine adjustment-screw has fifty 

 threads to the inch, and the 

 head is divided into 20 parts 

 for approximate measure- 

 ment of the thickness of cov- 

 er-glasses. The coarse adjust- 

 ment has large pinion-heads, 

 giving great control over the 

 motion of the bodies. The 

 binocular bodies are adjustable 

 by rack and pinion. The bin- 

 ocular prism is con- 

 tained in the usual slid- 

 ing box, in a nose-piece 

 that fits in the lower 

 end of body tube by a 

 well made bayonet- 

 catch. 

 By re- 

 moving 

 the nose- 

 piece, a 



clear 

 field is 

 given to 



lenses 

 having 

 the 1% 

 in. screw 

 and by 

 screwing 

 into this 



ordinary 

 with 



so- 



threud 

 nose-piece 



ciety screw, one is 

 thus prepared for 

 the use of low power 

 lenses of wide angles 

 without having them 

 handicapped by the 

 several diaphragms of the binocular 

 arrangement. This is an improve- 

 ment which we regard as one of 

 considerable value. Most binocular 

 stands do not permit of the em- 

 ployment of wide angled objectives 

 to their best advantage. The stage 



