Ixvi 



NA TURE 



[June 15, 1905 



THE JUBILEE CATALOGUE 



ISSUKD TO MARK THE 



FIFTY YEARS' EXISTENCE OF THE FIRM 

 OF 



E. LEYBOLD'S NACHFOLGER, 



eOLOGIVE, 



Contains on its more than 900 pages a complete 

 survey of the apparatus used for instruction in 

 Physics, as well as numerous practical instruc- 

 tions and about 3000 illustrations. 



NATURE says:— "The firm of Leybold Nachfolger 

 in Cologne has recently issued a very complete and 

 interesting catalogue of physical apparatus and 

 fittings sold by them. The book starts with a history 

 of the instruments made in Cologne during the last 

 century. In its second section we find an account 

 of the construction and fittings of various chemical 

 and physical institutions. After this follows the cata- 

 logue proper, filling some 800 large pages, profusely 

 illustrated and admirably arranged. The book will be 

 most useful to the teacher," (No. 1846, Vol. 71.) 



THE CATALOGUE WILL BE FORWARDED TO SCHOOLS 

 AND INSTITUTES ON APPLICATION. 



CARL ZEISS, 

 JENA 



BRANCHES- 

 LONDON— 29 Margaret Street, Regent Street, W. 



Berlin, Frankfort o/M. Hamburg, Vienna, St. Petersl>urg. 



PalmOS Cameras. 



Fitted with ZEISS LENSES. 



Sli^ES— 6x9 and 9X12 cm,, and 3'( in,X4j-in, and 5-in,X4-in. 

 Also 9X 18 cm, for Stereo and Panorama. 



SUITABLE FOR PLATES, PACK FILMS, AND 

 ROLL FILMS. 



Illustralid Calak\:;iiL, " Pn" Post Fra on applicaliou. 



STAR MICROMETERS. 



The Illustration shows a star 

 micrometer of the form designed 

 by Mr. A. R. Hinks, and made by us 

 for the University Observatory of 

 Cambridge, England, as vi/eli as for 

 the Observatory of Tacubaya (see 

 Monthly Notices, Roy, Astron. Soc, 

 Vol. LXI., p 444). The coordinates 

 of a star upon a celestial photograph 

 impressed with a standard reseau 

 are obtained very readily, the errors 

 being imperceptible. 



We also make a simple form of star 

 micrometer, which is highly accurate 

 in performance, although the adjust- 

 ments are less elaborate. 



We make a special feature of in- 

 struments for research, and we may 

 mention as examples of our design 

 and construction the Spectrohelio- 

 graph at Kodaikanal, and an appar- 

 atus for enlarging and rectifying 

 stellar spectrograms at Poona. 



We shall be glad to answer the 

 enquiries of interested parties. 



The Cambridge Scientific 

 Instrument Company, Ltd., 



CAMBRIDGE, ENGLAND. 



