A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 1868, Vol. 72] 



Registered as a Newspaper at the General Post Office.] 



THURSDAY, AUGUST 17. 1905,. 



[Price Sixpence 



[All Rights 



Re: 



GARDEN 



SUN=DIALS. 



Terra-Cotta Pedestal, 



fitted with a loi" Porcelain 



Dial," 



£4 8 O. 



Fluted Pedestal with 8K" Dial 



complete, 



£2 XT 6. 



Neb; Illustrated Catalogue, 

 32 pages, post free, 



NEWTON & CO., 



Optitiaus to His llajestv Tile Kiiiii 

 and H.K.H. The Prince 



3 FLEET STREET, LONDON. 



THE NEW 



"LONDON" 



MICROSCOPE. 



With Eye -piece | inch, | inch 



Object - glasses, in Mahogany 



Case, 



£5 12s. 6d. 



Double Nose-piece, 9/- extra. 

 FocussiDg Substage, 14/6 extra. 



R. & J. BECK, Ltd., 



68 CORNHILL, 



Chemical and Scientific Instrument Makers to His Majesty's 



Government (Indian, Home, and Colonial). 



LABORATORY FURNISHERS and MANUFACTURING CHEMISTS 



CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied 



to National Physical Laboratory, Teddington, fitted for Gas, Water 



and Electricity. 



Catalogue of Chemical and Physical Ap/>aratus, 350 //. and 1200 



Illustrations, free on ap/ilicalion. 



Designs of Benches and Fittings to suit all fehuirements. 



14 COMMERCIAL STREET. LEEDS. 



NEGRETTI & ZAMBRA'S 



LONG RANGE BAROMETERS 



THE DIAGONAL BAROMETER.— In this instrument 

 the tube is much longer th.-iii usual, and at the point on the 

 \ertic3l column where in ordinary Mercurial Barometers the 

 28 inches would be marked, the tube is bent at an angle and 

 the remaining 3 inches of the scale — viz. : 29, 30, and 31 — 

 are extended over a tube 36 inches iong. 



The mercury now moving diagonally instead of vertically, 

 travels over 12 inches of the tube to every inch on the ver- 

 tical scale. 



The slightest variation, even 01" to which the scale is 

 divided, is at once noticeable and can be easily read without 

 the aid of a vernier or magnifier. 



Further Particulars ami Prices of this and other lon^ 

 > xngc Bar.}>iieters sent on anpUcation to the ^rannfacturers. 



NEGRETTI & ZAMBRA, 

 38 HOLBORN VIADUCT. 



lES: 45 CORNHILL, and 122 REGENT STREET, 

 LONDON. 



