A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

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



No. 517, Vol. 20] THURSDAY, SEPTEMBER 25, 1879 [Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



SUN DIALS. 



Fig. I. 



Brass Circular Horizontal Sun Dial divided to 5 

 minutes ; 4 inches diameter, ;£\ Zs.; 8 inches, 

 ^2 %s.; 12 inches, ;^ 3 i6x. 



Dials on Zinc or Slate for any latitude. 



i t: 



Fig. 2. 



Brass Sun Dial, with levels and adjusting screws 

 arranged so that it can be set for use in any latitude 

 North or South, in Morocco or Mahogany Case, 

 2\ in. diameter, £1 15^.; 3^ in. diameter, ;^ 5 ; 

 4^ in. diameter, £(>. 



^. 



JOHN BROWNING, 



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



ROYAL OBSERVATORY OF GREENWICH, AND THE OBSERVATORIES OF KEW, CAMBRIDGE, 



MELBOURNE, THE U.S. NAVAL OBSERVATORY, CAMBRIDGE AND HARVARD 



UNIVERSITIES, HOBOKEN COLLEGE, &c., &c. 



63, STRAND, W.C. 



FACTORY— SOUTHAMPTON STREET, LONDON, W.C. 



ESTABLISHED 100 YEARS. 



