CHEMICAL APPARATUS. 



101 



Pepy's Gas Transferor. (Y\g. 566.) A 

 small instrument for the conveyance of a 

 small quantity of gas from one vessel to ano- 

 ther. It consists of a glass tube, shaped as 

 in the cut, both ends being open, and one of 

 them drawn to a fine point. A tight piston 

 and rod fits into the straight part of the tube. 

 All the parts of the instrument below the pis- 

 ton are filled with mercury. To use the in- 

 strument, immerse it in a jar of gas, by passing 

 the point upwards through the mercury in 

 the mercurial trough. Draw up the piston, which will draw 

 up the mercury also, and suffer the gas to enter the point 

 of the transferrer. When enough gas has entered, depress 

 the point below the surface of the mercury, and elevate the 

 piston a very little to draw a globule of mercury into the 

 fine orifice. When this has been done, the instrument may 

 be taken out, and the gas it contains be carried where it 

 may be required. Price, 75 cts. 



Glass Syringe. (Fig. _ *'te- 567 - 



567.) This instrument 

 is formed of a piece of 

 straight glass tube drawn 

 at one end to a point, 

 having a piston packed with tow attached to a wire handle. 

 By means of this instrument a globule, or small quantity, 

 may be drawn into the tube, and transferred to any 

 other vessel. Price, 75 cts. Fi - 56a 



Apparatus to show the Condensation of Liquids by 

 Mixture. (Fig. 568.) This consists of a tube of 

 glass having a double globe, as represented in the 

 cut. To use it, fill the tube and one ball with one 

 liquid, as water, and the other ball with another, as 

 alcohol, sulphuric acid, &c. ; cork it and turn it 

 upside down. The diminution of volume when the 

 two are mixed together will be seen in the tube. 

 Price, $1.25 to $3.00. 



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