COMBINED WASH-BOTTLE AND PIPETTE. 



419 



'J-, 



< Cs 



no. 



F 



ij.2 



The measurements given are those of the actual apparatus 

 made for use. Vessel a which is of thin glass 13*3 cm. 

 long and 1*4 cm. wide, is graduated in cubic centimetres 

 and fractions thereof, tube 6 is 5 mm. in diameter and 13*3 

 cm. long from junction at top of a to the bottom where it 

 just enters c, (to bring b out more clearly for the purpose 

 of photographing, it was partly filled with coloured liquid). 

 Tube g is sealed on to a, and is connected to the lower 

 extremity of f by a piece of stout rubber tubing. To use 

 the vessel, rod d is slightly raised, the watertight joint at 

 d' where rod d is ground into c, is thereby broken, air is 

 blown from the mouth through the rubber connected to h, 

 which is in direct communication with the air of flask only, 



