BAIRD &TXTLOCK (LONDON) LTD. 



5738 



5738 T Browning's New Miniature Spectroscope, with micrometer, adjustable slit, achromatic 



lens, and right-angled prism for showing two spectra in comparison. Complete, in case 3 10 



This portable and complete instrument may be used for showing any of the leading experiments in spectrum 

 analysis, the Fraunhofer lines, the lines in the spectra of the metals, and the alkaline earths and alkalies, the spectra 

 of gases, and absorption bands. 



Applied to a telescope, it may be used for viewing th I lines of the solar prominences. It can also be used as 

 a micro-spectroscope. The position of the bands in any spectrum may be measured with the attached micrometer. 



5739 



5739 T Direct-Vision Spectroscope, Browning's, with five prisms, fitted in mahogany case . . 5150 



This spectroscope is a most powerful and portable direct-vision instrument, easily separating the D lines 

 in the solar spectrum. 



A5739 1 Direct Vision Spectro'scope, as above, on brass tripod stand with clips . . . . 7 17 



5741 



5740* Pocket Spectroscope, for clinical purposes, showing the Fraunhofer lines distinctly 



when held to the sky, with adjustable slit, comparison prism, and side mirror, in case. . 1 18 



5741* Pocket Spectroscope as above, with wave-length scale, which is projected upon the 



spectrum, as a means of measuring the latter . . . . 3 10 



5742' Coyer Glass Gauge, for quickly and easily measuring the exact thickness of cover 



Its range of measurement extends from o-oi mm. to o'8 mm. . . 1 10 



CROSS STREET HATTON GARDETST, E-C 



1044 



