ESTBD. 'KM^'^poTy' 1765. 



SCIENTIFIC ll\STRLinEI\T M4I\1JF4CTIJRER. 



Tin- foUowint; . atalogues post frci- 



Section I. (MICROSCOPES and ACCESSORY APP/\RATUS. 

 Section II. SURVEYmC a^d DRAWING INSTRUMENTS. 

 Section 111. OPHTHAL(V|OLOCICAL ifJSTRUIVlENTS, 



Section IV. GENERAL OPTICAL, METEOROLOCIC/\L, and ALLIEO INSTRUMEfJTS (in preparation) 



JA.WARY ISSLi; OF Sl:CO\n.H \.\l> LIST (Of piig:-s) AO»V READY. 



244, HIGH HOLBORN, LONDON. 



J. SWIFT & SON, 



Manufacturing: Opticians to H.M. Govt. 



SEVEN GOLD MEDALS AWARDED FOR OPTICAL EXCELLENCE. 





NEW RESEARCH MICROSCOPE with full 



mechanical movements, vi/,. coarse adjustment l)y spiral raclc 

 and pinion, slow motion by "Ariston" patented adjustment, 

 rack and pinion rectangular motions to stage, suljstage with 

 focussing and centring adjustments and Sir A. E. Wright's 

 improved method of throwing the condenser out of the axes of 

 the microscope. 



Price fitted with Triple Dustproof Nosepiece, Ahbe 

 Condenser with Iris Diaphragm, Two Oculars, f.", J/', and j./ 

 Oil Immersion Objectives, in Cabinet ... ... £21 O O 



nV hare reccntli/ supplied to the (Tdver/iiiieiit orey 21)0 of these 

 inxfruiueitts for the A.M. Dept., ^yar Ojliee, (iiid the J. M.S. 



UNIVERSITY OPTICAL WORKS, 

 81, Tottenham Court Road, London, W. 



SECOND-HAND BOOKS 



HALF PRICES! 



NEW BOOKS at 25 jver cent. Discount. 



Books in all branches of SCIENCE, NATURAL HISTORY, MATHEMA = 

 TICS, &C., and for all Examinations (Elementary and Advanced) supplied. 

 Sent on approval. Lists Free. State Wants. Books Bought. Best prices given. 



J. R, rOYLE, 



135, CHARING CROSS ROAD, LONDON, W.C 



(7".\'-< ;!n'ini/,s fioiii Ox/or, t >/.) 



■■9 •■■■■10 ■■■■ MiCM ■■■• ■^■■■■■V flHBBBH 



( vii ) 



—I 



