100 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



sive smell, or other inconveniences. Aromatic waters and 

 essential oils may thus be obtained from lavender, roses, and 

 other plants and flowers ; and alcohol and brandy may be 

 distilled from wines, cider, &c. They are usually made of 

 copper, the boiler holding from one quart to a gallon. 



Price, $6.00 to $8.00. 



Fig. 564. Hope's Eudiometer (Fig. 564) consists 



of a glass bottle, holding about a gill, hav- 

 ing a stopper in its side ; and a glass tube 

 closed at one end, and ground into the neck 

 of the bottle at the other end. The tube 

 is graduated into 100 parts. It is used in 

 the examination of gases, atmospheric air, 

 &c. Its mode of use is, to fill the gradu- 

 ated tube with the gas to be tried, and fill- 

 ing the bottle with some solution, capable 

 of absorbing the gas, or one of the gases, 

 if a mixed gas, as the atmospheric. The 

 oxygen may be absorbed and its amount 

 indicated by opening the stopper in the 

 side under water, when the liquid will rise 

 in the tube. Price, $2.50. 



Ure's Eudiometer (Fig. 565) consists of 

 a glass tube bent in a U form and closed 

 Fig. 565. at one end, the closed tube being gradu- 

 ated into 100 equal parts, and having in- 

 serted near the end, two platina wires, the 

 outer extremities being formed into rings, 

 or small balls for the passage of an electric 

 spark. 



In the analysis of atmospheric air, a 

 known quantity is introduced, and to it 

 added a like quantity of hydrogen gas ; the 

 remainder of the graduated tube, bend, and 

 a portion of the open tube being occupied 

 with water. The thumb is placed on the open end of the 

 tube, and the gases exploded by the passage of an electric 

 spark between the platina wires. The quantity of gas left 

 is then ascertained, and deducted from the original quantity, 

 one-third of the remainder being the quantity of oxygen 

 contained in the atmospheric air examined. Price, $4.00. 



