furnaces.

In view of this, the details of actual consumption of gas on a
regular customer's order job will be of interest. The "Revergen"
furnace, manufactured by the Davis Furnace Company, Luton, Bedford,
England, was used on this job, and is provided with regenerators
and fired with illuminating gas at ordinary pressure, the air being
introduced to the furnace at a slight pressure of 3 to 4 in. water
gage. The material was charged into a cold furnace, raised to 1,652 deg.F.,
and maintained at that temperature for 8 hr. to give the necessary
depth of case. The work consisted of automobile gears packed in
six boxes, the total weight being 713 lb. The required temperature
of 1,652 deg.F. was obtained in 70 min. from lighting up, and a summary
of the data is shown in the following table:

Cubic Foot Total
Per Pound Number of
of Load Cubic Foot
Gas to raise furnace and charge from
cold to 1,652 deg.F., 70 min. 1.29 925
Gas to maintain 1,652 deg.F. for 1st hour 0.38 275
Gas to maintain 1,652 deg.F. for 2nd hour 0.42 300
Gas to maintain 1,652 deg.F. for 3rd hour 0.38 275
Gas to maintain 1,652 deg.F. for 4th hour 0.42 300
Gas to maintain 1,652 deg.F. for 5th hour 0.49 350
Gas to maintain 1,652 deg.F. for 6th hour 0.49 350
Gas to maintain 1,652 deg.F. for 7th hour 0.45 325
Gas to maintain 1,652 deg.F. for 8th hour 0.45 325

The overall gas consumption for this run of 9 hr. 10 min. was only
4.8 cu. ft. per pound of load.

THE CARE OF CARBURIZING COMPOUNDS

Of all the opportunities for practicing economy in the heat-treatment
department, there is none that offers greater possibilities for
profitable returns than the systematic cleaning, blending and reworking
of artificial carburizers, or compounds.

The question of whether or not it is practical to take up the work
depends upon the nature of the output. If the sole product of the
hardening department consists of a 1.10 carbon case or harder,
requiring a strong highly energized material of deep penetrative
power such as that used in the carburizing of ball races, hub-bearings
and the like, it would be best to dispose of the used material to
some concern whose produ