NA TURE 



December 30, 1922 



The BECK 



HIGH- 

 POWER 



BINOCULAR 



(Patent) 



Not only an advance on 

 previous Binoculars, but 

 better than a Monocular 

 with all powers. 



I. Resolution equal to that 

 of a Monocular. 



Equal illumination in 

 both eyes. 



Short tube length, 

 making Microscope 

 compact. 



No special object- 

 glasses or eyepieces 

 required. 



Standard angle of con- 

 vergence. 



Binocular vision, saving 

 eyestrain and giving 

 better results than 

 Monocular vision. 



7. Converted into a Mon- 

 ocular by a touch. 



Full descriptive Price List on application. ~\ 



R. & J. BECK, Ltd., 68 CORNHILL, LONDON, E.C.3. 



RESEARCH MICROSCOPES. 



pable of showing known structure, but the 



;s. mii>t never be in the position ot feeling that it he 



The Microscope used in routine laboratory work must 1 

 worker who is trying to elucidate a problem, or to discover 

 ^A^SSMS^SSfar., must have every refinement and advantage that the stand and lens 



i give 



Watson's " Van Henrck " Microscope has been the instrument par excellence for many years a ^l>«». 

 is being used in all parts of the world for microscopical research and high power photo-imcrographic^ work. 



The g Substage has a Fine Adjustment, so that the modern and very necessary Oil Immers on ondenser can be 

 as precisely focussed as the Objective. Delicate adjustments are available for varying thicknesses ot cover glasses. 

 The Stage rotates concentrically and has mechanical movements finished b 



The whole instrument is built on solid lines equal to a one-piece casting, 

 hand in the only shop in the world where such work is done to-day : 



WATSON'S HIGH BARNET WORKS. 



Full particulars of Watson s « Van Heun k V Microscopes are contained in their Catalogue of Microscopes, post 



W. WATSON & SONS, LTD., 



313 High Holborn, London, W.C 



ESTABLISHED 



BELLS HILL, HIGH BARNET. 



A few of the many advantageous features of 



SPENCER MICROSCOPES 



1. Automatically lubricated fine adjustment bearings. 



2. Black lacquered body tubes, avoiding reflection of light into eyes of user. 



3. Low compact construction (considerably lower than others), which affords greater 



ease and comfort in using. 



4. Low position of the fine adjustment, head away from the mouth and breath of the user. 



5. Extra large stages with unusual distance from optical axis to base of the arm. 



Spencer Microscopes represent careful attention to 

 the little things which generally escape attention. 



STANDLEY BELCHER & MASON, Ltd., Church Street, BIRMINGHAM. 



Britain by R. & R. Cl 

 London, W.C.2, 



,KK, Ltd., Bran, 

 nd The Mao^ii! 



on street, r oinutu&u, juiu j. 



|p., 6 yaNr 



in & Co., Limit 

 -Saturday, December 30, : 



