

BAIRD &TATLOCK (LONDON) LTD. 



4234 s Tintometer No. 18. The Chromo-Pyrometer, for temperatures of incandescent 



furnaces of metals. Price with one temperature . . . . . . . ; ..55 



Additional degrees . . . . . . . . . . . . . . each 5 



4235 s Tintometer, as recommended by Prof. H. R. Proctor and Dr. J. Gordon Parker, and 

 adopted by the International Association of Leather Trade Chemists as the standard 

 method of measuring colour in extracts and tanning materials. 

 Instructions, using the Standard ol half per cent. Solution of Tanning Matter in 1 centimetre Cell. 



The apparatus consists of the binocular tintometer, in polished box with stand and reflector, 0.5 centimetre 

 and i centimetre glass cells, and 88 standard glasses, 33 of red, 30 of yellow, 20 of blue, and 5 colourless. 



To ascertain the colour the following method is adopted : The required quantity of extract previously 

 calculated, according to analysis, is weighed into a 500 cubic centimetre flask, and made up with boiling distilled 

 water to 50 cubic centimetres ; the solution is then allowed to cool, after which it is filtered and measured in a 

 centimetre cell in the tintometer in the usual manner. 



NOTE. Although perhaps theoretically not always quite accurate, it is a considerable saving of trouble, 

 and also of avoiding the errors of making and filtering a fresh solution, to make the colour measurement on the 

 solution made for analysis, containing about 0.4 grain of tanning matter penoo cubic centimetres, and to reduce 

 the results to half per cent, by dividing by the actual strength and multiplying by 0.5. 



Complete price . . . . . . . . . . . . . . . . 10 15 



Accessories for Lovibond's Tintometer. 



796 



