BAIRD &TmOCK. (LONDON) LTD. 



5^47-5748 

 5747 T Student's Spectrometer, No. 2 pattern, as specified below, in case . . . . . . 600 



This instrument was designed to meet the requirements of the Department of Agricultural and Technical 

 Instruction for Ireland, for a cheap, yet reliable Spectrometer. 



It has a protected 5-inch circle, read by vernier to i minute. The circle and telescope are attached to the 

 outer centre and move together. The telescope is counterpoised and provided with cross-wires, rack-motion 

 focussing arrangement, clamp and fine adjustment. The collimator has a protected adjustable slit and clamping 

 ring, so that it caa be set for verticality and focal distance once for all. The prism table is adjustable by means of 

 three levelling screws, and can be raised or lowered to any convenient height ; it can be clamped to the inner centre 

 which carries the vernier, and which is provided with clamp and fine adjustment. The object glasses of both 

 telescope and collimator are about 7 inches in focal length, and have a clear aperture of $ inch. Adjustments are 

 provided for setting the optical axes of telescope and colhmator at right angles to the vertical axis of the Instru- 

 ment. One eyepiece, grating holder, prism clamp and reader are supplied with the Instrument. 



5748r Student's Spectrometer, as above, without rack motion and fine adjustments . . 500 



ACCESSORIES FOR SPECTROMETERS, Nos. 5747-5748. 



57491 with two verniers . . . . . . . . . . . . . . extra 076 



5750 T Rack motion to collimator . . . . . . . . . . . . ' . . 0100 



575 1 T With g-inch telescope and collimator . . . . . . . . . . extra 5 



5752 1 Comparison prism attached to slit .. . . . . . . . . . . . . 07 



5753 T Extra dense flint glass prism . . . . . . . . . . . . 10 



5754 T Ordinary dense flint glass prism . . . . . . . . . . 09 



5755 T Crown glass prism . . . . . . . . . . 090 



5756 T Hollow prism, with f-inch hole . . . . . . . . 0106 



5757 T Copy of Roland's grating . . . . . . . . 15 



5758 T Illuminating attachment to eyepiece .... 076 



5759 T Plane parallel mirror, silvered both sides . . . . . . 0100 



5760 T Large ordinary dense flint glass prism, suitable for the g-inch telescopes . . . . 0160 



5761 1 Ditto, crown glass ...... 16 



5762 1 extra dense flint glass .... 0170 



1046 



