6 o ; f- ^ 



A WEEKLY ILLUSTRATliD JOURNAL OF SCIENCE. 



" To the solid ground 

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



No. 2139, Vol. 84] 



THURSDAY, OCTOBER 27, 1910 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights Reserved. 



poiliAfsiscope:. 



Elbow PolaPiseope, for illustrating the various phenomena 



of polarized light, with polarizing glass plates, prism and 



lenses, mounted in brass, with rack adjustment to focus tube, 



in case, complete, dBT 7s. 



3 FLEET STREET, LONDON. 



JOHN J. GRIFFIN & SONS, 



LTD., 



Makers of Scientific Apparatus, 



KINGSWAY, LONDON, WC, 



have received the following awards 



at the 

 Brussels International Exhibition, 1910, 



GRAND PRIX. 



DIPLOMA OF HONOUR. 

 2 GOLD MEDALS and 



I SILVER MEDAL. 



REYNOLDS & BRANSON, Ltd., 



Manufacturers of Chemical and 

 Physical Apparatus. 



THE "RYSTOS" ELECTROSCOPE. 



This Electroscope, with paraffin 

 insulator, remains charged for at least 

 a day, and has been used with the 

 greatest satisfaction in many secondary 

 schools for the last ten years. A 

 customer states that the batch of two 

 dozen, obtained two years previously, 

 has remained in efficient condition 

 during that time. 



(a) Price with attach 



movable for cle 

 (6) Ditto, with two gl. 



age caused by a radio-i 

 (c) Ditto, with transparent sci 



for project _ _„ ^„,_ .__. „.,„ a„„,^ 



by means of a lantern j 



14 coiviivie:s{cx.h.i:.. srrxiEES'r', r^BEias 



ent for two Wires and top re- 1 -- , . 



ning the glasses ...I ^1- "'=''• 



i« tubes for showing the ieali- 1 _ ,„ „,,. 



:tive gas.. / ^'® ^^«^*'- 



scale, lecturer's pattern, ~l 



ge of gold leaf and scale ]- T/6 each. 



NEGRETTI 



Standard . . 

 Meteorological 

 Instruments. 



Z AM BR AS 



Full particulars post f 'e on applit 



38 HOLBORN VIADUCT, LONDON, E.G. J^ 



Branches: 45 CORNHILL, E.C. ; and 122 REGENT ST., W. 



