BAIRD &TATLOCK (LONDON) LTD. 



3164 3165 3166 



Flasks, graduated (ounces), with mark on neck. 



Capacity . . . . . . . . 5 10 20 40 oz. 



3164 Price, unstoppered .. ..1/3 1/6 1/9 2/6 each. 



3165 stoppered .. .. .. 1/6 1/9 2/- 3/- 



3166 Flask, with graduated neck, for oil testing, 225 cubic centimetres (bulb 200 cubic centi- 

 metres, neck 25 cubic centimetres in fifths) . . . . . . . . each 



3 



3167 



3168 



3167 New Pattern Graduated Flask, for preparing standard solutions. Designed by O. C. M. 



Davis, Esq., B.Sc., F.I.C., University of Bristol. Price, each, unstoppered, 4/- ; stoppered 

 This flask is graduated to hold i litre, the capacity of the bulb being 975 c.c. and the neck graduated 25 

 c.c. in -Jth divisions. For accurate reading the neck has white back with blue line down centre. 



METHOD FOR USING FLASK. 



In preparing volumetric solutions of substances which cannot be directly weighed with accuracy, it is usual 

 to first make the solutions a little over the required strength and then adjust after titrating with some standard 

 solution. E.G. It was necessary in a special case to dilute 985.5 c.c. of a solution of Sodium Hydroxide to 

 1000 c.c. in order to make in deci-normal. In using the ordinary cylindrical measure for such a solution owing 

 to its -wide bore it is difficult to measure the exact volume required. With the flask now introduced this error 

 is avoided and increased accuracy is obtained, also saving of time. 



3168 Flask, stoppered, with graduated tube for testing paraffin scale (Mr. D. A. Sutherland's) 



each 



4 



3 





-CROSS STREET HATTOTST GARDEIST, E-C 



600 



