RAIRD &TATLOCK. (LONDON) LTD. 



WARRANTED QUALITIES OF "RESISTANCE" GLASS. 



We offer full guarantee that our " Resistance " Glass, lately again improved, is not surpassed by any other 

 glass on the market in resisting sudden changes of temperature and the action of hot water as well as of corrosive 

 chemicals. No solution of glass can be detected, and beakers or flasks may be used with naked flame of a Bunsen 

 burner without risk of breakage. 



The articles made of this glass are well finished and will prove to be considerably larger than stated, the 

 capacity indicated filling the vessels only up to 2,'3rd 3,4th of the height and not up to rim as frequently in 

 practice. I B T I 



All vessels bear the registered trade mark R in circle, our \,J brand and the capacity in ccm. stamped on ; 

 apparatus, etc., made of tubing show blue stripes. \s 



Inferior imitations being sold, precaution is necessary in purchase. 



In glass of ordinary quality it is found that nearly always about 200 400 thousandths of a mg. of constituent 

 matter are dissolved out of a surface of 100 cm. square. The insolubility of our " Resistance " glass has reduced 

 this to I-^JTF of a mg.in cold water and T J,jmg. in hot water. (See Certificate of Reich's- Anstalt, Charlottenberg.) 



2716 

 2716 Flasks of " Resistance " Glass, with flat bottoms, each marked with 



and our brand 



and 



Flasks made in this quality of glass are specially recommended for use in tropical climates as very 

 infusible, and as a rule withstand sudden variations of temperature without cracking. 



Capacity 60 125 175 250 350 500 750 1000 1500 2000 3000 c.c. 

 Price 3d. 3d. 4d. 4d. 6d. 7d. 8d. lOd. lid. 1/1 1/4 each. 



2/6 2/9 3/3 3/6 4/9 6/- 7/- 8/6 9/6 11/3 14/9 per 



- 



2717 



2717 Flask of" Resistance " Glass, with three necks. The middle neck may be used for the insertion of a stirre 

 or condenser, the smaller necks for funnel or thermometer. This flask will prove very useful for the 

 organic analysis, etc. 



Capacity .. .. .. .. I 2 litres. 



Price 



2/3 



2/9 



4/3 each. 



CROSS STREET HATTON GARDETST, E*C 



528 



