578 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Application of the Stereo-Komparator to Monocular Use, and a 

 Specially Designed Monocular Comparison Microscope.* — C.Pulf rich's 

 article is mainly occupied with the testing of star-photographs ; but he 

 shows how a microscopic method may he adapted to the comparison of 



\ 



A 





/ 



■ 



M. 



\iJ 



Fig. 81. 



two plates for monocular observers, that is, by observers who prefer 

 to work single-eyed. The paths of the rays are shown in fig. 81, 

 which will be easily understood. The author seems pleased with the 

 results obtained. 



Gelblum, S. — Le mouvement lent dutube de microscope. 



[The author attacks the problem by methods of mathematical analysis. He 

 suggests that a part of the tube should be threaded, and should work in a 

 nut — the whole forming a male and female screw — so that the fine adjust- 

 ment would be obtained by rotating the tube.] 



Zeilschr. iciss. Mikr., xx. (June 1904) pp. 421-8 (7 figs.) 



M. — Die ntue Binocular-Lupe von E. Leitz "Wetzlar. 



Zeitschr. angew. Mikr., ix. (1903) p. 291. 



(2) Eye-pieces and Objectives. 



Blakesley, Th. H. — Single-piece lenses. 



Proc. Phys. Soc. Lond., xviii. (1903) p. 591. 



Conbady, A. E. — On the chromatic correction of object-glasses. 



Monthly Not. Boy. Astron. Soc, lxiv. (1904) p. 274. 



Feuy, Ch. — Method e nonvelle pour la determination des constantes des lentilles. 



Bull. Soc. franc de Physique, 1903, p. 22(3. 

 Haetmasn, J. — Objectivuntersuchungen. 



Zeitschr. Tnstrume?itenh., xxiv. (1904) p. 1. 



Kerber, A. — TJeber den Astigmatismus von Fernrohr- und Mikroskopobjectiven. 



Mechaniker, xi. (1903) p. 157. 



Trotzewitsch, S. E. — Anfertigung von Objectiven fur Telescope, Mikroskope 

 und photographische Apparate. Die optische Technik du Mikroskope und 

 Teleskope. 



[Russian.] Warsaw (1903) 322 pp. 



Anonymous— Sammellinse mit Irisblende von Carl Zeiss. 



Deutsche Mechaniker ■•Zeitung, iii. (1904) p. 28. 



* Zeilechr. Instrumentenk., xxiv. (1901) pp. 161-6 (1 6g.). 



