BAIRD & TXTLOCK. (LONDON) LTD. 



5766-5767 



5766 T Spectroscope, after Kirchhoff and Bunsen, vith micrometer scale, and illuminating lamp, 



adjustable slit arranged for two spectra. Price, without accessories . . 

 Accessories 

 5767 r Two gas lamps, adjustable, with chimneys 



5768 T Twelve glass tubes, with two stands 



5769 1 Two tables with illustrations and five lithographed millimetre scales . . 



550 



10 

 4 

 2 



5770 



5770 T Browning's Student's Spectroscope, in stained cabinet 



This instrument has a prism of extremely dense glass, of superior workmanship. The circle is divided and 

 reads with a vernier, thus dispensing with the inconvenience of an illuminated scale. This arrangement possesses 

 the very great advantage of giving angular measures in place of a perfectly arbitrary scale. The slit is also furnished 

 with a reflecting prism, by means of which two spectra can be shown in the field of view at the same time with ij 

 in. prism divided arc to 360 vernier, etc. 



8 



I 



5771 



5771 1 Browning's " Universal " Spectroscope, in cabinet 



This instrument is of new design and can be used as a spectroscope or spectrometer. It has a I J-in. dense 

 flint prism, achromatic object glasses of about 9 in. focal length, and high-power eyepiece giving a high dispersion. 

 It reads by means of the vernier to i minute, and has clamping screws for fixing in any position. The prism 

 table rotates and may be raised or lowered and levelled by means of levelling screws. The collimator has an 

 adjustable slit, to which is attached a right-angled reflecting prism, so that two spectra may be seen in the field of 

 view and easily compared. 



700 



1P4.R 



