LABORATORY SUPPLIES AND CHEMICALS 



107 



HESS-IVES TINT PHOTOMETER 



2347b 



2347e 



The Ives' Tint Photometer is an instrument for comparing different shades and 

 hues of light colored materials or liquids with each other and with fixed standards, in 

 order to differentiate and classify them, and give them numerical expression. It is 

 adapted particularly, and far better than any other existing means or device, to tests 

 of paper-pulps, different hues and grades of white and tinted paper, transparency of 

 waxed and similar papers, color of oils and other liquids, qualities of flour as shown 

 in prepared baked samples, white pigments in oil or turpentine, cottonseed meal, 

 etc., etc. 



The Ives' Tint Photometer is used like a telescope, presenting to the eye a 

 circular field with vertical hairline central division, one side of which is filled through 

 a slit with light directly from a standard white magnesia block, while the other is 

 filled through another slit with light from the sample to be compared, measured and 

 given numerical expression. The slits are adjustable, with a reading-scale, and the 

 light coming through them is spread evenly across the respective half fields by means 

 of a patent revolving optical mixing-wheel between the slits and the field lens. 

 Especial attention is called to the fact that personal color equation and even a marked 

 degree of color blindness do not affect the readings obtained with the Tint Photometer. 



In order to assure definite and constant illumination of standard and sample a 

 "daylight" lamp must be employed. 



For other special purposes, such as measuring the transparency of waxed and 

 similar papers and substances, or light colored liquids in long tubes, special fronts 

 are provided, at an additional cost of from $5 up. 



PRICES 

 2347b HESS-IVES TINT PHOTOMETER, complete as illustrated $175.00 



2347c DAYLIGHT LAMP, as shown in 2347e 20.00 



(State voltage when ordering.) 



2347d CABINET, as shown in 2347e 60.00 



2347e HESS-IVES TINT PHOTOMETER with daylight lamp and cabinet... 275.00 



