A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

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



No. 507, Vol. 20] 



THURSDAY, JULY 17, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.} 



[All Rights are Reserved. 



BROWNING'S ANEROIDS. 



"The Aneroid is the best Weather-Glass w;r(/^."— Colonel Sir Henry James's "Treatise on Meteorological 

 Instruments." 



Mr. Belville, of the Royal Observatory, Greenwich, in giving the meteorological result of a tour in Wales, 

 obtained by means of an Aneroid, says : — 



" It was a delightful companion, and highly useful, its indications preventing many an excursion which would have ended 

 in disappointment." 



From its extreme sensitiveness, great portability, non-liability to derangement, and elegant appearance, the 

 Aneroid is rapidly superseding the Mercurial Barometer for all general purposes. 



KXACT SIZB. 



Watch-form Aneroid, in Gilt or Nickelisel Case ... £2 10 

 Best Watchfotm Aneroids, compensated for temperature, and 

 constructed expressly for measuring heights, with scale of alti- 

 tudes, ij, ij', or 2 inches diameter ... £4 48. and £5 5 



Best Aneroid, with Carved Oak Frame, various patterns, and 

 Thermometer, Chased Dial S inches iu diameter, from 



£4 to £4 15 

 Illustrated Catalogue of Meteorological Instniincnts sent post free. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.M. GOVERNMENT, THE ROYAL SOCIETY, THE 



ROYAL OBSERVATORIES OF GREENWICH AND EDINBURGH, AND THE OBSERVATORIES OF 



KEW, CAMBRIDGE, DURHAM, UTRECHT, MELBOURNE, &c., &c. 



6 3, STRAND, W.C, LONDON. 



FACTORY— SOUTHAMPTON STREET, LONDON, W.C. 



