

BAIRD &. X^TLOCK (LONDON) LTD. 







4011 



4013 



4011 Stopcocks, glass, for adapting to tubes, etc., length about 9 in., finest quality, accurately 



ground. I to 6 millimetres solid plug, 7 to 10 millimetres hollow plug. 



Bore of plug 1234567 9 



Price 1/6 1/9 2/6 3/- 3/9 4/6 6/- 7/6 8/6 



4012 Stopcocks, glass, second quality, length about 9 in. (as Fig. 4011). 



Bore of plug . . . . . . i 2 3 



Price 1/2 1/4 1/8 



This quality will only be supplied to order. 



4013 Stopcocks, glass, with capillary tubes, i to 2 millimetres bore (oblique bore plug) each 



5 



31- 



8 



si- 



10 



10 



mm. 

 each. 



mm. 

 each. 







->xrl 



...^ 



4014 4015 



4014 Stopcocks, glass, with capillary tubes, i to 2 millimetres bore . . 



4015 Stopcocks, glass, for aspirator bottles. 



Bore of plug . . . . 3 4 



Price .. .. . . 2/- 2/6 



4016 Stopcocks, glass, three-way. 



Bore of plug 

 Price 



4016 



each 



8 

 5/- 



2 



2/6 



10 mm. 

 6/- eac 



4 mm. 

 3/6 each. 



Greiner and Friedrich's Original Patent Glass Stopcocks, well-made and carefully 



ground. 



These stopcocks are made with oblique borings, and so avoid the furrow formation between collar and stopper, 

 which so soon causes the ordinary stopcock to leak. In the case of the three-way stopcocks they are opened 

 and closed by a turning of 90 and 180 instead of 45, which much facilitates exact work. 



4017 



4017 Stopcocks, glass, with straight tubes. 

 Bore of plug 

 Price 



........ 2 3 4 n 



2/4 3/- 3/6 each. 



4018 Stopcocks, glass, with straight tubes, capillary bore, i to 2 millimetres bore of tube. 



Same pattern as No. 4017 . . . . . . . . . . each 



4019 Stopcocks, glass, with straight tubes and mercury cup. 



Bore of plug .. .. .. .. .. 2 3 4 mm - 



Price . . . . . . . . . . . . 4/- 51- 5/6 each. 



CROSS STREET- HATTCTNT GARDETST,E ; G 



756 



