A WEEKLY ILLUSTRATED JOURNAL OF SCIENCESs^^^. ^ 



" To the solid ground •'•ili^^l 



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



3 1812 



No. 2247, Vol. 90] 



THURSDAY, NOVEMBER 21, 1912 



[Price Sixpence 



Registered sls a Newspaper at the General Post Office.) 



(All Rights Reserved. 



NEWTON & CO.'S 



NEW MODEL 



ASTRONOMICAL 

 TELESCOPE. 



By Royal Warrant to H.M. //,e King 



72 WIGMORE STREET, LONDON, W. 



K.iablished ov 



John J. GRIFFIN U 



ONS 



KEMBLE STREET, 



KINGSWAY, LONDON, W.C. 



MAKERS OF PHYSICAL APPARATUS. 



SMALL DIRECT VISION 

 SPECTROSCOPE. 



With Plain Slit, 22- With Adjustable Slit, 27/6 



RAINBAND SPECTR OSCOPE, 45/ - 



Write for Lists on Electric Furnaces, Pyromeiry, &c., &c. 



GRAND PRIX. TURIN, 1911. 

 SILVER & BRONZE MEDALS. YORK. 1912. 



SOLE AU'rHORISP:D MAKKkS 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 reflected 

 upwards for the projection 

 of objects in a horizontal 

 plane, condensers 4^ in. diam., 

 with silvered back 

 I can be used at "C," 

 i an erecting prism 

 ount "D." lime-light 

 r, slide carrier. Price 



without reversible adjustable 

 table " B," £9 10 



Ditto, ditto, with "Phccni.v" Arc Lamp 10 17 6 



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



The "College" Lantern, without adjustable table, with 



complete 7 12 6 



Ditto, ditto, \ 



Slit and prism for spectru 



Polariser and analyse 



Optical Lante 



.arc lamp 



'ith support, for either lantern . 



9 

 1 7 6 



„ --^^ 223 pages. 



ica! Apparatus and Chemicals, 44 pages. 

 ■ ig Building and Machine Construction. 



14 coivi]viE:Etcz.a.i:^ sthe:k:t, il,e:e:x»s. 



The 



"Public School" 



Set of 



Meteorological 



Instruments 



forms 



a simple complete Climatological 

 Station at a moderate price. 



A Pumphld describing Ibis Scl. and Price 



List, " Meleorological Inst' umcnls," Will 



be sent post free to any address. 



NEGRETTI & ZAMBRA 



Holborn Viaduct, London, E.C. ; 

 45 Cornliili, E.C. ; and 122 Regent Slreel. W. 



