698 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



MICROSCOPY. 



A. Instruments, Accessories, &c* 



(1) Stands. 



Swift's "Ariston" Fine Adjustment. — J. Swift and Son claim 

 that their new fine adjustment (fig. 129) entirely eliminates the side- 

 movement which occurs in so many instruments when the micrometer- 

 screw is put in motion. The accompanying illustration, which gives a 



sectional view, shows how the 

 principle of the apparatus has 

 been worked out. The milled 

 head of the screw is isolated and 

 supported on an independent tube 

 fixed to the base-piece. The only 

 point of contact of the micro- 

 meter-screw is its fine point 

 bearing upon the top of the 

 fine adjustment. The advantages 

 claimed for the Ariston fine ad- 

 ustment are that even with a 

 coarse screw a very slow rate of 

 speed and extremely delicate 

 focussing are obtained ; that it is 

 practically impossible for it to get 

 out of order, and that the micro- 

 meter-screw is entirely discon- 

 nected from any of the fittings 

 likely to produce movement when 

 the milled head is touched. 



Fig. 12 9. 



Scheffee, W. — Mikroskope. 



[A popular introduction to the 

 instrument.] 



Forms Bandchen 35 of the series 

 " Aus Natur und Geisteswelt," 

 B. G. Teubner, Leipzig. 



(2) Eye-pieces and Objectives. 



Berger's Stereoscopic Loups. f — E- Berger has arranged a com- 

 bination of stereoscopic loups which seems likely to be of considerable 

 service to miniature painters, lithographers, microscopists, watchmakers, 

 and others who are interested in delicate handicraft. The author thinks 

 it offers many advantages over the present watchmaker's lens. In the 

 construction two of Berger's decentric lenses inclined to one another in 

 the horizontal meridian are used. The inclination is so arranged that 

 the light rays do not fall at too great an angle on the strongly prismatic 



* This subdivision contains (1) Stands ; (2) Eye-pieces and Objectives ; (3) Illu- 

 minatiug and other Apparatus; (4) Photomicrography ; (5) Microscopical Optica 

 and Manipulation; (6) Miscellaneous. 



t Central. Zeit. f. Opt. u. Mech., xxiii. (1902) pp. 145-6 (3 figs.). 



