Data of Tests on Condensing System of Detroit Gas Works. Station A. All weights are in grams per cubic foot of gas.

New Plant.

REMARKS.-In this works the gas goes through a primary condenser, exhauster, P. and A. tar separator, second and third condensers, box washer and rotary washer.

Data of Tests on Condensing System of Detroit Gas Works. Station A. New Plant.

All weights are in grams per cubic foot of gas.

"

*At the rotary washer outlet, tar was practically absent, the naphthalene under the heading, “in tar and water,' being mostly in the free crystalline state and visible as such. If the "total naphthalene" be considered to be in a state where it could have been absorbed by the gas, and had it passed completely into the vapor state, it would have saturated the gas at an average of 73°F instead of 62°.

Data of Tests on Condensing System of Grand Rapids Gas Works. All weights are in grams per cubic foot of gas.

REMARKS.-In this works the gas goes from the primary condenser through the exhauster to the P. and A. separator, then to the washer-cooler (a combined condenser and scrubber) and then to the purifiers.

Data of Tests on Condensing System of Detroit Gas Works.

All weights are in grams per cubic foot of gas.

Station A. Old Plant.

REMARKS.-In this works the gas goes from the hydraulic main to the exhauster then through a tar washer to condensers, then to rotary washers and purifiers.

Point

Weight

Weight

of Sampling

of

of

Naphthalene

Tar and

Anhy

in

in Tar

drous

Water

Anhydrous Total

and

Tar

Tar

Water

Data of Tests on Condensing System of Ann Arbor Gas Works.

All weights are in grams per cubic foot of gas.

Percentage Weight of Naphthalene

REMARKS. In this works the gas goes from the primary condenser through the exhauster to the P. and A., then to the secondary condenser, tar washer and rotary scrubber.