\ W I I Kl \ II LI SIR VILD JOL RN VI Ol SC ItNCF 



7 o the soltd ground 

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



NEWTON & CO.'S 



PATENT 



"DEMONSTRATOR'S" LANTERN. 



n| The most simple 

 jj and efficient 

 I • Single Lantern 

 1 11 yet constructed 

 r-\ for general 

 -i---? seientifle work. 



;ij THIS SEASON'S 

 CATALOGUE OF 

 SLIDES, &c., 

 POST FREE. 



FOR LIMELIGHT OR ELECTRIC. 



With Prism for Erecting, 

 and for Vertical Projection. 



Price £10 10s. 



3 FLEET ST., 

 LONDON. 



RUBENS' LINEAR THERMOPILE. 



JOHN J. GRIFFIN & SONS, Ltd., 



MAKER5 OF SCIENTIFIC INSTRUMENTS. 



REYNOLDS & BRANSON, L° 



LABORATORY OUTFITTERS and 

 SCIENTIFIC INSTRUMENT MAKERS. 



r 



BENCHES 

 MADE and 

 DESIGNED 

 FOR ALL 

 REQUIRE- 

 MENTS. 



Also . . 



APPARATUS 



OF 



RELIABLE 



QUALITY. 



Enquiries 

 Solicited. 



14 COMMERCIAL STREET, LEEDS. 



NEGRETTI & ZAMBRA'S 

 LONG RANGE 



BAROMETERS. 



THE GLYCERINE BAROMETER. 



This Barometer has a lube containing both Mercury and 

 Glycerine. The lighter snecitic gravity of the latter and 

 the difference in the 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 interesting instrument the smallest 

 variations in the atmospheric pressure are quite notice- 

 able, differences of looth of an inch being easily read 

 without the aid of any vernier or magnifier. 



Further Particulars and Prices of this a 

 long range "Barometers sent on appUt 



\d other 

 ition 



to the Manufacturers- 



NEGRETTI & ZAMBRA, 



38 HOLBORN VIADUCT, E.G. 



Branches: 45 CORNHILL, and 122 REGENT 

 STREET, LONDON. 



