LABORATORY SUPPLIES AND CHEMICALS 275 



SPECTROSCOPES AND ACCESSORIES 



We are capable of supplying any of the standard American made spectroscopes. 

 Below we list a type of spectroscope which is in general use in laboratories today. 

 The smaller instrument is especially adapted for school use. Any apparatus embodying 

 special optical features can be furnished upon receipt of specifications. Estimates 

 cheerfully given on any optical instruments, and repair of same. 



3810-1 



3810-1 SPECTROSCOPE. The usual standard type fitted with collimator, 

 observing telescope and scale tube. The collimator is stationary and 

 fitted with adjustable slit having jaws of German silver. The 

 observing telescope has coarse adjustment only around the axis. 

 Both collimator and observing telescope are fitted with achromatic 

 objectives of 25 mm. aperture. The other necessary adjustments 

 for adjusting the tubes in horizontal position are provided. This 

 instrument is now furnished with a liquid prism for bi-sulphide of 

 carbon, but provision is made for adjusting scale tube and observing 

 telescope so that other prisms of any dispersion may be used. The 

 cost of the instrument including prism is $48.00 



Accessories for this instrument: 



1st. Comparison Prism for Slit $ 5.00 



2nd. Rack and Pinion Motion for Slit 5.00 



3rd. Slow Adjustment for observing telescope (tangent screw) 5.00 



4th. Illuminating Burner (gas) for scale tube or collimator 3.00 



3810-2 Is a less expensive instrument for school use which is smaller, but other- 

 wise of the same type as No. 3810-1. 

 Price 30.00 



