Sample D is of the tar as pumped from the tar-well receiving the drains from the wash-boxes, first scrubbers and condensers, from which the circulating pump is supplying the wash-boxes; this sample is drawn from the tar stratum.

Specific gravity of all samples was nearly 1.1 that of water. At 400° the distillate becomes heavier than water.

At ordinary temperatures, the residues left at 5500 and 6170 were soft pitch, but would not flow.

NOTE R.

INFLUENCE OF CONDENSERS AND SCRUBBERS ON COMPOSITION OF WATER-GAS, BY J. E. BLOMEN (Chicago)

B is the gas after passing the first condenser.

C is the gas after passing the second condenser.

At the end of test E, there was 4 per cent. of tar in the sawdust in the purifying box. At the end of test F, there was 6/10 of one per cent. of tar in the sawdust in purifying box.

NOTE S. TABLE IX.

TABLE FOR CARBURETTED WATER-GAS SATURATED WITH AQUEOUS VAPOR, NO OTHER VAPORS BEING PRESENT-SHOWING, WITH CHANGE OF TEMPERATURE, THE CHANGE IN VOLUME OF UNIT WEIGHT OF GAS AND THE CHANGE IN WEIGHT OF UNIT VOLUME OF THE MIXTURE OF GAS AND AQUEOUS VAPOR.

Computed by W. E. MCKAY. 1897.

Barometric variations of pressure exceed the usual variations of pressure at different points in a gas works, and the mixture of gas and vapor has been considered as under the normal pressure of 30" mercury.

Column I. gives the temperature in degrees Fahrenheit.

Column II. gives the tension of saturated aqueous vapor in inches of mercury, corresponding to the temperature in I. This vapor tension is from Dixon's tables for latitude 53°.

Column III. gives the pressure under which the gas is contained; this pressure is 30"-the vapor tension in Column II.

Column IV. gives the volume of unit weight of gas, at the temperature and pressure given in Columns I. and III. Unit weight of gas (51 pounds) is the weight of the gas in the mixture of 1,000 cubic feet of gas and vapor at 60° F Unit volume is 1,000 cubic feet.

Column V. gives the weight of aqueous vapor corresponding to the pressure in Column II. and to the volume in Column IV.; this weight is the aqueous vapor carried by unit weight of gas at the temperature given in Column I.

Column VI., the weight of gas and vapor, is 51 lbs. + column V.

Column VII. gives the weight of the mixture of gas and vapor occupying 1,000 cubic feet at the temperature and pressures stated.

Sample D is of the tar as pumped the drains from the wash-boxes, first from which the circulating pump is this sample is drawn from the tar strat Specific gravity of all samples was n

400° the distillate becomes heavier tha At ordinary temperatures, the resi were soft pitch, but would not flow. NOTE R.

INFLUENCE OF CONDENSERS AND SCR

OF WATER-GAS, BY J. E. BLO

Hydrogen

Marsh Gas

Light Hydrocarbons (CnHn+2).

Heavy Hydrocarbons

Carbonic Oxide....

Carbonic Acid..

Sulphur..

Nitrogen..

A is of the gas before all condensers.

B is the gas after passing the first condenser.
C is the gas after passing the second condense

Inlet to first scrubber..
Outlet to first scrubber...

Outlet to second scrubber.

Outlet to drying apparatus.

At the end of test E, there was 4 per cent. of tar in in the purifying box. At the end of test F, there was 60 per cent. of tar in the sawdust in purifying box.