A WEEKLY ILLUSTRATED JOURNAL OF SCIEI 



" To the solid ground 

 Of Nature trusts the mind which builds for aye."- 



Wordsworth. 



NEWTON & CO. 



NEW MODEL 



ASTRONOMICAL 

 TELESCOPE. 



nplete wiih 3^ in. t 



;s, 2 eyepieces, finder, 



on altazimuth btand 



Complete 



£15 



By Royal Warrant lo H.M. Ih'e 



72 WIGMORE STREET, LONDON. W. 



Established over 200 Years Telegrams: " Newlohar, London. " 



WHEATSTONE'S 



COMPOUND 



GYROSCOPE. 



Accessory parts are also 

 supplied for performing 

 numerous interesting and 

 instructive experiments in 

 the Dynamics of Rotation. 



Price £3 3 O 



JOHN J. GRIFFIN & SONS, i 



Kemble St. 



KINGSWAY 



TD. 



LONDON, W.C. 



GOLD MEDALS : LONDON. 1908. ALLAHABAD. 1911. 

 GRAND PRIX. TURIN. 1911. 2 MEDALS. YORK. 1912. 



SOLE AUTHORISED MAKERS OF 



STROUD & RENDELL SCIENCE LANTERNS. 



The "'University" Lan- 

 tern, with Russian iron 

 body, sliding baseboard, two 

 superior objectives, plane 

 silvered mirror '* A," which 

 is moved by a knob causing 

 the rays to be reflect d' 

 upwards for the projectroit 

 of objects in a horizon:al 

 plane, condensers 4^ in. diam., 

 with silvered back 

 e used at " C," 

 erecting prism 

 'D," lime-light 

 : carrier. Price 

 travelling case, 

 "ble adjustable 

 £9 10 



Ditto, ditto, with "Phyllis" Arc Lamp 10 17 6 



Reversible adjustable table " B" for supporting apparatus, extra 7 6 



The " College " Lantern, without adjustable Ubie, with 



lime-hght burner complete 7 12 6 



Ditto, ditto, with " Pha:nix ■■ arc lamp ... 9 



Slit and prism for spectrum with support, for either lantern ... 1 7 6 



Polariser and analyser 2 



Catalogues post free. 



Optical Lanterns and Accessory Apparatus. 223 pages. 



New Abridged List ot Chemical Apparatus and Chemicals. 44 pages. 



Mechanical Models tor teaching Building and Machine Construction. 



l ^ COIVIIVIEgICIA.L. STFtEETP, LEEDS. 



NEGRETTI & Z AM BRA'S 



Standard Meteorological Instrume -. 



(Jl typical Srilish Climalological Station.) 



38 Holborn Viaduct. 



London, E.G. 



45 Cornhill, E.G. 



122 Regent Street, W. 



