Supplement to " Natui'e," . Jttne i, 1905 



THE SYTAM SYSTEM 



Saves an incredible amount of wall space and 

 completely utilises dark corners, recesses, and 

 out-ofthe-way places. 



Prevents crowding' and confusion. 



Allows for extension as and when required. 



Always room for more, hence reorganisation 

 seldom or never necessary. 



Saves time, lightens work, and increases comfort 

 by producing perfect order in the Laboratory, 

 Library, Study, Home, Oflice, &e. 



THE BOTTLE ELEMENT. 



One hundred 4 oz bottles are arranged in one 

 Sytam Bottle - Element occupying less than 

 1 sq. ft. of Tvall space, eacii bottle is instantly 

 located, removed or replaced, and any size from 

 Joz. to a ■Winchester can be accommodated in 

 one and the same element. 



THE CLOSED-FRONT BOOK ELEMENT. 



THE OPEN-FRONT BOOK ELEMENT. 



THE AUTHOR'S FILE. 



For division of subject into headings, chapters 

 or sections. 



THE TWIN DESK TRAYS. 



THE PAMPHLET FILE. 



THE SYTAM FITTINGS CO., 



18 & 19 BASINGHALL BUILDINGS. LEEDS. 



RADIUM "CLOCKS.' 



1. FOR THE LECTURE TABLE. 



2. FOR LANTERN SLIDE USE (as figured). 

 Discharging every 40 to 100 ^ecomis according to quantity of 



Radium. 



PRICES will be quoted by return post. 



Kindly Note. — IVe cannot send these clocks by parcel post nor lend 



•We can supply FROM STOCK 



PURE RADIUM BROMIDE 



■Veiry 



of the 



Acti-yjty , 



in 5 mg. tubes at a 

 Itea.soina.ljle F»i:'ice. 



Manufacturing Chemist, 

 10 NEW CAVENDISH ST., LONDON, W. 



Price 



£6 



Price 



£6 



HEELE'S TABLE SPECTROSCOPE. 



Especially constructed for use in fiecondurij Schools and TerJnucal '^'o^'-^^^-/'''; P7^"^.°f f,'"^f "'"'^'^i^ 



(N = 1-64). Collimator and observing telescope have an aperture of 22 mm. and a local length of 7 >"■. the latter wuh 



eye" piece magnifying 7x. The spectroscope is provided with scale-telescope wUh photographed scale. The instrument, 



which is extremely solid and tigid. separates the D line distinctly. 



Holtoorn, MSl.C 



PETER HEELE, 1X5 Higlx 



MAKER OF PHYSICAL, ASTRONOMICAL, AND OTHER INSTRUMENTS. 



