KNOWLEDGE. 



December, 1910. 



CARL ZEISS (London), Ltd., 



13-14, Great Castle Street, Oxford Circus, W. 





Fnew and improved^ 

 microscopes by leitz 



liavins. besides other advantages, thfl 



FINE AND COARSE ADJUSTMENTS fitted with SAFETY 



MOVEMENTS. 



1 liii.iljlL-, uilli liin^ed joint and 

 revolving and centrini^ 



Stand A, 



ciampinc; le\<;r, circular 



stage, coarse adjustment by rack and pinion, fine 

 adjiistnienl l^y new continuous safety micro- 

 iiieler movement having divided drum (each 

 ■ iivi^ion = ^j.V.;-. mm.), wide tube adapted for 

 photo-micrography with wide-angled lenses without 

 eye-pieces, sf'iduated draw-tube, large illuminating 

 apparatus, ii is diaphragm giving <'l)'lique illumina- 

 tion, swing out condenser and cylinder iris 

 iaphragm fitted with rack and pinion, triple nose- 

 iece, apochroniatic objectives ]6. 8. 4, and 2 mm. 

 immersion, compensating eye-pieces 

 4. S, 12, iS. compensating eyepiece 6 

 uith micrometer, dra\\ ing eyepiece. 

 arge mechanical stage for examinin- 

 pecimens measuring up to rin^. ]>\ 



Magnifications, 64-2300. 

 (Viniplete in mahoi^anv' 



' £52 2 O 



Same Stand and illumijKainL; 

 Ins. with triple nose-piece, 

 latic objectives ■}. ,', (or I), and 

 lil immersion, three eyepieces. 

 Magnifications, 51-1000. 

 Complete in mahogany 

 case £24 O O 



Also iMicrntome.s, Photnmicrn- 

 graphic Appaiatus, I ni\ersal 

 Prujectinn Apparatus, Prism 

 Field (ila<^scs. and Phcitn- 



graphic Lenses. 

 El LEITZ, Oxford House, 9, Oxford St.. London. W 



^ 



USEFUL AND LASTING PRESENTS 

 FOR CHRISTMAS. 



ABSOLUTELY UNEQUALLED 



ROSS' NEW STEREO PRISM BINOCULARS 



ChSP ^mf Prices from £6 1 O. 



from £2 2s. 

 Celebrated TELESCOPES, 

 .^^ PHOTOGRAPHIC LENSES, 

 po»crs-(,.s.w.oru,imcs. CAMERAS and OUTFITS. 



i"iiiiiiiiiB»:.i..Mi'Mii i 



"HOMOCENTRIC LENS, 



F/5*6 F/6'3, K/do. I',.^. 



"MULTI-SPEED" SHUHER. 



AkKKM> MO] Ion. 



Hill particulars of ihn Panros, Reflex, Twin-lens, ..ml .iihcr 



.aiiKTas are foinul in Rn^s' , :,i J,,-u,; : .,N,, .., .iiipl.-le ,l,s,;i ipii,,,, „f the New 



Multi-Speed Shutter ir High Speed Work, and .>f vari ..^ 



K.inl.Mi.iti-.ns (mi Telephotography. 



OF ALL LEADING DEALERS EVERYWHERE, 



lllustiated DcscriptiM" I'rice List Forwarded f-ree hy Pcist cm applicaliciii. 



ROSS, Ltd., 111, New Bond St., W. 



:;l, (.'.>.ksi>ur Street, l...n,lMn, S, W". ri|,i,, .,| W.,rks, i la].li.,ni I ..nnncn. 



Adam Hilger, Ltd. 



Optical Department. 



HKiH OLAI.ITV PRIS.MSOI" (iLASS, QUARTZ, &c. 



PLANH-PARALLKL <il ASS FOR INTERFERENCI 

 WORK. 



TEST PLANES AND RHf LECTIN(i PLANES. 

 LARGE PRISMS AND LARUE PLANES FOR 

 ASTRONOMERS. 



.\ii<l all H.iiL 



|)i(iiliicli<>n 'i| 

 tiiate aiiijlf^ 



accii:alrlv tint 



Instrument Department. 



SPECTROSCOPES OF EVERY DESCRIPTION. 

 AllCHELSON, and FABRY and PEROT INTER- 



FEROAtETERS, 



MICHELSON ECHELON DIFFRACTION GRATINGS 



SPECTROPHOTOMETERS. 



WAVELENGTH SPECTROSCOPES. 



QUARTZ SPECTROGRAPHS. 

 .\\v\ othei High-clas.s Instruments. 



I litjh (iiKilitv work alone undertaken: 



1.1 all work cl(, 



75a, CAMDEN ROAD, LONDON, N.W. 



I .-Ic-r.iiMs : ■■ SfMM:lLlT\, LmM.un." Telr|.liOrH- : XORTH lOSy. 



AWARDED GRAND PRIZE, BRUSSELS EXHIBITION, ipio. 



Illuslrateii Lists of Spectroscopes ,iiid Spectioscopic App.o-.itns 

 of all kinds gratis on reiiuest. 



