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SOS'''/?- 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



ANEROID BAROMETER, 



framed in solid oak, handsomely 

 carved, with silvered engraved 

 dial, and thermometer. Of highest 

 quality throughout. Suitable for 

 hall or library. 



16 inches high ... £4 14 6 



20 „ , ... £6 16 6 



CIRCULAR OAK FRAME 



BAROMETER, £1 5 0. 



These Instruments are English 



throughout^ materials, ivork- 



manskipy and carving. 



Barometers of every description, 



from 21/- each. 

 Pedometers for measuring the 

 distance walked (London-made), 



from 17/6 each. 



Illustrated Caialogiie, a,d. 



NEWTON & CO., 



Ol'TICIANS TO H.M. THE 



King, 



3 FLEET ST., LONDON. 



X-RAY TUBES. 



Special arrangement 

 for the 



REGULATION OF THE 



aS^ HEAVY DISCHARGE 

 TUBES 



for use with 



ELECTROLYTIC 

 >- BREAKS. 



Send for our 

 New Price List. 



JOHN J. GRIFFIN & SONS, Ltd., 



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

 LONDON, W.C 



A NEW 

 LENS 





^m\L o/f^ 



KOR ALL 

 WORK. 



Im 3 Series. 

 I. GENERAL. 

 II. CONVERTIBLE. 

 III. SF-ECIAL PROCESS. 



<fe 



^ 



This rapid, wide, medmni or narrow :nii;le lens all in one is 



suitable for all work 



J^ull Catalogue free on application to the RTantifacittrers : — 



68 CORNHILL, LONDON, E.G. 



NEW PATTERN COMBINED 



BARO-THERMOGRAPH. 



The above in'^Irument i: onilines in one nppar.lliis the Recording Baro- 

 meter and Recording Thermometer, giving thus on one and the same chart 

 continuous records of the atmospheric pressure and temperature for seven 

 days. 



Ittustratctt price lists of Scientific [nstrnments/ree hy post to all parts 



oftkc 



rl.t. 



NEGRETTI & ZAMBRA, 

 38 HOLBORN VIADUCT, E.G. 



Branches : 43 CORNHILL, and 122 REGENT STREET. 

 AWARDED TWO GOLD MEDALS PARIS EXHIBITION 1900. 



^^'onal W: 



