45, CORNHILL, B.C., AND 122, REGENT STREET, W., LONDON. 269 



928 Field's Differential or Eatio -Micro Polariscope, an instrument for the 



mathematically-exact application of Polarised light in Microscopical 

 research ; price, with new rotating body prism, packed in mahogany cabinet 



17 10 



Only adapted for Instruments having Sub-Stages. 



929 Improved Micro Spectroscope. Showing two Spectra in the field of view at 



the same time ; the small prism by means of which the second spectra is 

 produced is made to remove from the field of view when only one spectra 

 is required : this instrument is supplied with two adjustable slits at right 

 angles to each other, with adjustments for regulating the width of slit 

 required, and the eye lens is also furnished with rack and pinion 

 adjustment for focussing the spectra and lines under examination. The 

 stage for holding Sorby's tubes, wedge cells, &c., for showing the spectra 

 bands, are made to remove with the reflecting mirror from the body of 

 the instrument when not required : this spectroscope with achromatic 

 lens to eye-piece, complete as described above, fitted to any microscope 



770 



For Pocket Microscopes and Hand Magnifiers see pages 223 and 224. 



APPARATUS, ETC., FOB MICROSCOPES. 



Each. Each. 



930 Eye Pieces, Huyghenian (figs. 930 and 930*) . . . 10 6 15 6 



931 Ditto ditto Best A, B, C, and D, E, and F . 16 110 



932 Ditto, Erecting, for Dissecting 15 100 



933 Ditto Achromatic 1 12 



934 Micrometer Eye Pieces 140 



935 Kellner's Orthoscopic Eye Pieces, giving larger field . 1 10 



936 Ross's Centreing Glass 15 



937 Indicator to Eye-piece 066 



938 Brook's Double Nose Piece, for rapidly changing the 



Object Lens or power of a Microscope ... 1 10 



940 Stand Condensers, small (fig. 940) 10 6 16 



941 Ditto ditto with Large Lens and convenient 



adjustments (fig. 941) 22s. 1 10 1 16 



942 Shadbolt's Parabolic Condensers, in brass mountings . 1 14 2 15 

 942* Amici's Prisms ....,.,.. 2 10 6 



943 Achromatic Condenser, plain 250 



944 Ditto ditto Gillet's 700 



945 Achromatic Eye Pieces, D 16 



946 Ditto ditto E 18 



947 Kingsley's Illuminator 3 18 



948 Reade's Hemispherical Condenser 220 



949 Lieberkuhn, or Cup Reflector . . . 10s. 6d. 16 100 



950 Rectangular Prism, for use instead of a mirror . . 1 10 2 10 



951 Rainey's Light Modifier 076 



952 White Cloud Illuminator ...... 12 6 



