66 BENJ. PIKE'S, JR. DESCRIPTIVE CATALOGUE. 



graduated into 100 equal parts, and used in measuring vo- 

 lumes of gas, transferring given quantities, &c. 



Price, with stop-cock, pint, $2.75 ; quart, $3.00 ; 

 i gall. $3.50 ; gallon, $4.00. 



Fj g- 49S - Adapter, (Fig. 498). A glass 



:T '&^^7^^=~^ i -"^ ^ U ^ e P en at Dot h ends, used to 



* ^N^s= '""" connect a retort with its receiver 



whenthe neck of the former is 

 not long enough. Price, 25 cts. to 50 cts. 



Tubes of Glass, Porcelain, &c. (Fig. 499, as below.) 

 Tubes are made of glass, porcelain, stone-ware, brass, and 

 lead, and are used in distillation, evaporation, to connect 

 apparatus for the conveyance of liquids and gases, and for 

 other purposes, and may be obtained straight or bent in 

 any form required ; they are usually furnished in lengths of 

 about three feet long, varying in diameter from one eighth 

 of an inch to one and a half. Porcelain and stone-ware 

 tubes are usually about one inch in diameter, and two feet 



Fig. 499. 



long ; small sized lead and brass tubes may be obtained in 

 lengths of ten feet or more. Flexible tubes, the foundation 

 being a spiral formed of twined iron wire, over which fine 

 twine is braided, and then a coating of india rubber, and 

 over that a braid of fancy colored twine, which is varnished 

 and highly polished ; forming an elegant, useful, and very 

 durable tube that may be bent in any manner, being quite 

 flexible, and of important use in many pneumatic experi- 

 ments, also used for conveying the gases in hydro-oxygen 

 microscopes, compound blow pipes, dissolving view appa- 

 ratus, &c. 



Price, small glass tubes in lengths of 3 ft., 15 cts. to 25 cts. 

 " larger " " 31 cts. to 50 cts. or 63 cts. each. 

 " fine porcelain tubes, 18 inches long, 63 cts. " 

 " " stone-ware, " " 38 cts. to 63 cts. " 

 " small lead, per foot, - 8 cts. 



" " brass, " 12 cts. to 18 cts. 



" flexible tubes, half inch diameter, per foot, 86 cts. 



