A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. i85i, Vol. 72J 



THURSDAY, JUNE 29, 1905:. 



Registered as a Newspaper at the General Post Office.) 



INDUCTION COILS 



are the finest and most eflieient in the world. 



The capacity of our Factory (Newton Works) is now 

 10 large coils per week. We have at present in hand 

 orders which will take the whole output for about the 

 next 5 months, but we can still take a few orders for 

 Coils for immediate delivery. 



Supplementary List of NEW "Xray" and "High 



Frequency " apparatus and reduced prices of " Apps 



Newton" Coils post free on application. 



SOLE MAKBRS- 



NEIRTTON <& CO., 



SCIENTIFIC INSTRUMENT MAKERS 

 To H.M. THE KING. H.R.H. THE PRINCE OF WALES and 

 the GOVERNMENT. 



3 FLEET ST., LONDON, E.C. 



RUBENS' LINEAR THERMOPILE. 



JOHN J. GRIFFIN & SONS, Ltd., 



MAKERS OF SCIENTIFIC INSTRUMENTS, 

 S£i.K>dinia. Street, London, -VW.C 



[Price Sixpence 



[All Rights are Reserved. 



REYNOLDS & BRANSON, L> 



LABORATORY OUTFITTERS and 

 SCIENTIFIC INSTRUMENT MAKERS. 



14 COMMERCIAL STREET, LEEDS. 



NEGRETTI & ZAMBRA'S 

 LONG RANGE 



BAROMETERS. 



THE GLYCERINE BAROMETER. 



This Barometer has a tube containing both Mercury and 

 Glycerine. The lighter specific gravity of the latter and 

 the difference in ihe bore of the tube in which it rises and 

 falls increases the scale to about 8 inches for -each inch of 

 the ordinary mercurial column. 



By means of this intere ting instrument the smallest 

 variations in the atmospheric pressure are quite notice- 

 able, differences of 100th of an inch being easily read 

 without the aid of any vernier or magnifier. 



Further Particulars and Prices of this and other 



Jang range "Barometers sent on application 



to ihe Manufacturers— 



NEGRETTI & ZAMBRA, 



38 HOLBORN VIADUCT, E.C. 



Branches: 45 CORNHILL. and 122 REGENT 

 STREET, LONDON. 



