A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

 Of Nature trusts the mind which builds for ay^."— WORDSWORTH 



No. 522, Vol. 20] 



THURSDAY, OCTOBER 30, 1879 



[Price Sixpence 



■ Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



BROWNING'S 

 MICROSCOPES 



MICROSCOPE, extra large model, with 

 firm highly-finished stand, rack and fine 

 adjustment to body, large mechanical stage, 

 with rectangular and circular motions, and 

 spring object-clamp, perfectly concentric ad- 

 justable sub-stage for apparatus, graduated 

 drawer tube, large plane and concave mirrors 

 on a double-jointed arm, large size stand 

 condenser, one pair each. A, B, and C eye- 

 pieces, 2-in. objective of i6° angular aperture, 

 l-in. of 25°, and J-in. of loo°, with an adjust- 

 ment for the thickness of the covering glass. 

 Binocular arrangement and rack and pinion 

 adjustment to the two drawer tubes, for the 

 adaptation of the eye-pieces to the width of 

 the eyes of the observer ; packed in highly- 

 finished Mahogany Cabinet, with box for 

 apparatus. 



PRICE £42 Os. Od. 



PRICE LIST OF MICROSCOPES FREE. 



An Illustrated Catalogue of Mi- 

 croscopes, with 35 Illustrations, 8 

 whole page engravings, post free, 

 7 stamps. 



BROWNING'S new Cheap Series of higfh- 

 power Objectives, i-in. 80°, ^2 Ts. 6d. ; \-m. 

 90°, £2 12s. 6d. ; ^-in. 95°, ^3 Ss. od. 



JOHN BROWNING, 



optical attd Physical Instrument Maker to H.M 

 Government, the Royal Society, the Royal Obser- 

 vatories of Greenwich, Edinburgh, &'i:. , &'c. 



63, STRAND, W.C, LONDON. 



Factory— Southampton Street and Exeter Street, London, 



Fiize Medal, iSOi. EslaHislud 100 Years. 



Telescof e?, Spectroscopes, Opera Glasses, &c., &c. 



