SCIENCE— ADVERTISEMENTS 



PULFRICH REFRACTOMETER 



AS MADE BY ADAM HILGER, Ltd., LONDON 

 IN OUR STOCK FOR IMMEDIATE SHIPMENT 



No. 45829 Pulfrich Refractometer, Hilger make 



45829. REFRACTOMETER, PULFRICH, Hilger's latest model, for the measurement of refrac- 

 tive indices of both solids and liquids to an accuracy of about O.OOOI, and the dispersion, i. e. 

 the difference of refractive index for two spectral lines, to about 0.00002 in the interval 1.33 to 

 1.73. With prism of refractive index D. of 1.74 for substances of refractive indices for D. be- 

 tween 1.47 and 1.73 with mount and carrier and improved water jacketing attachments. In 

 case with lock and key. 

 Duty Free 405.00 Stock 555.00 



45833. Hydrogen End-on Vacuum Tube, for use with Pulfrich Refractometer No. 45829. 



Duty Free 10.15 Stock 13.90 



45837. Prism of refractive index for D. of about 1.62 for liquids of refractive indices for D. between 

 1.33 and 1.61 with mount and carrier and with glass cell for liquids. 

 Duty Free 27.00 Stock 37.00 



Ordtrs accepttd for duty free importation with delivery in from twelve to fifteen weeks. 

 All prices subject to change without notice. 



ARTHUR H.THOMAS COMPANY 



IMPORTERS - DEALERS - EXPORTERS 



LABORATORY APPARATUS AND REAGENTS 



WEST WASHINGTON SQUARE PHILADELPHIA, U. S. A. 



