BAIRD &TATLOCK (LONDON) LTD. 



4261* 

 4262* 

 4263 1 



" Presser " for pressing powders evenly into trays 



Strong Pins for fabrics 



Filter Apparatus and packet of filter paper 



Thermometer for taking the melting-points of fats, waxes, etc. 



Pure Plaster of Paris for white background 



Strong Polished Box to contain sets 



Metal Cages to hold standard glasses in instrument 



TEXT BOOKS ON TINTOMETER. 



" Measurement of Light and Colour Sensations." By Joseph W. Lovibond .. 



" An Introduction to the Study of Colour Phenomena." By Joseph W. Lovibond . . 

 " The Teachers' Handbook of Colour." By Joseph W. Lovibond .. 



each 

 . . per doz. 



. . per oz. 

 from 10/6 to 

 each 



4264 

 4264 s Tintometer, Veley's, mounted on stand, as illustrated 



DESCRIPTION. 



The apparatus consists of a base board, on to which are fastened two wooden uprights at a distance 8.8 

 centimetres apart, and also a metal rod with adjusting screw. Two plane mirrors are attached to the upper 

 and lower ends of the uprights, the position of which, relative to the horizon, can be adjusted by means of the 

 screws. A metal screen on the upper part of the uprights serves to cut off extraneous light from the top mirror. 



Between the two mirrors is the tintometer box divided into two compartments by a wooden partition, 

 on which a wooden scale is fastened ; in each of the compartments is placed a glass cylinder to contain 

 the solutions, the tints of which are to be compared ; the level of liquid in the right-hand cylinder, with 

 side piece, can be varied by raising or lowering the glass vessel connected with the cylinder by flexible tubing, the 

 fine adjustments being made by the screw. Holes in the upper and lower framework of the box serve for the 

 insertion of a thermometer. 



It is advisable to take all the readings out in turns of lengths of movable columns of liquid, or to draw up 

 a table of corrections. 



For daylight working a window facing north is preferable ; for artificial light either a 16-32 candle electric 

 lamp with silvered back, or a Nernst lamp, both being enclosed in box open on one side only, may be used. 



The apparatus is suitable for nesslerisation, analysis by indicator, spirit analysis, comparison of beer-worts, 

 and generally of any turbid or coloured liquids. 





 

 

 

 



1 10 

 1 





 

 



7 

 5 

 



6 

 6 

 

 

 6 

 

 6 



6 

 6 

 6 



2 15 



ICHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



797 



