LABORATORY SUPPLIES AND CHEMICALS 



179 



2963-4 



2963-1 



2963-3 



2963-1 GENERATOR Parson's Automatic, for H 2 S, CO 2 and H. This is the most 

 popular generator for large requirements; used by the majority of edu- 

 cational laboratories throughout the country to distribute HzS to labora- 

 tory classes. 



The apparatus is perfectly automatic in action, and the refuse is auto- 

 matically removed, while the pressure is almost constant. Only fresh acid 

 comes in contact with the solid reagent, so that the full strength of the 

 acid is utilized. There are no stoppers or valves, the apparatus being con- 

 trolled entirely from the exits. It requires practically no attention, is 

 easily cleaned and refilled without being taken apart. Forty outlets flow- 

 ing at the rate of two bubbles every second can be furnished by one 

 apparatus. Most instructors prefer exits for use with hydrogen sulphide 

 to be situated in the hoods; the rubber connection containing a small 

 piece of capillary tubing, being concealed behind a block, screwed to the 

 wall; thus the student sees only a rubber tube protruding from a hole, and 

 being unaware that his supply is limited by the size of the capillary, has 

 no means of increasing the supply. Waste is thereby avoided. 

 Generator of light yellow acid proof stoneware, complete with the necessary 



glass parts and rubber stopper $25.00 



Crates and packing extra, 1.50 



Special globular iron sulphide, free from dust, for use with this generator; 



in lots of 25, 50 and 100 pounds respectively per pound, net, .20 



Lead Piping, with series of outlets for hood. Price according to number of 

 outlets and distance. 

 Renewals- 

 Bottle A 3.50 



Pot B 4.50 



Tower C 15.00 



Pot D 3.50 



Disc 75 



Non-syphoning tribe 50 



2963-2 Ditto For Chlorine, and other gases. Of best acid proof stoneware, with 

 air tight covers ground on. 



Capacity, gallons ' 6 12 20 25 33 39^ 



Each '. $4.50 6.50 10.00 12.00 13.50 17.50 



2963-3 Ditto, With inside vessel 5.60 8.00 12.00 14.20 17.00 22.00 



2964-4 Ditto For Chlorine. Of best acid proof stoneware, with perforated 

 ground stoppers. 



Capacity, gallons 14 /4 /^ 1 1/4 



Each $1.50 1.80 2.20 3.00 4,25 



