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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



ANEROID BAROMETER, 



5-inch Dial, with T hermometer in Carved Circular 

 Oak Frame, £1 5 0. 



A NEW 



LENS 



FOR ALL 



WORK. 



. V^ In 3 Ser.es. ^r^ 



^^« I. gf.ner.'^l. ^r 



^^ 11. CO.N'VKI"^""' " '^ 



,%W III. S[ECI.\ 



ANEROID BAROMETER, in Metal Case, £1 10 0. 



These Instruments are English throughout, materials, workmanship, 



and carving. 



Barometers of every description, from 21/- each. 



Pedometers for measuring the distance walked (London-made), from 



17/6 each. Illustratid Catalogtu; 4</. 



NEWTON & CO., Opticians to H.M. the King, 



3 FLEET STREET. LONDON. 



X-RAY TUBES. 



Special arrangement M. 



for the f « 



REGULATION OF THE 



'JSE) HEAVY DISCHARGE 

 TUBES 



for use \vith 



ELECTROLYTIC /( , 



> BREAKS. ' ^ 



Send for our 

 Niw Price List. 



JOHN J. GRIFFIN & SONS, Ltd., 



20-26 SARDINIA STREET, LINCOLN'S INN FIELDS, 

 LONDON, W.C. 



This rapid, wide, medium or narrow angle lens all in one is 



suitable for all work. 



full Catalogue free on apflieation to the Manufacturers : — 



R. <& «J. SSCK, Ltd., 



68 CORNHILL, LONDON, E.G. 



NEW PATTERN COMBINED 



BARO-THERMOGRAPH. 



Mie apparaius the Recording Baro- 

 ing thus on one and the same chart 

 pressure and temperature for seven 



nisfree hy f-ost to all parts 



The above in 



d Recording Thi 



records of the atmosphi 

 days. 

 Ilhntrated pHce lists of Scientific !nst?'n. 

 oftheivorUi. 



NEGRETTI & ZAMBRA, 



38 HOLBORN VIADUCT, E.G. 



Branches : 45 CORNHILL, and 122 REGENT STREET. 

 AWARDED TWO GOLD MEDALS PARIS EXHIBITION, 1900 



