counterbalances the apparent gain.

[Illustration: BURNS JUBILEE GAS ROASTER]

_A Typical Coal Roaster_

A typical United States coal roaster is shown in the accompanying cut.
It is the latest form of that type of Burns machine which requires a
brickwork setting. The picture shows the roaster ready to operate,
except for smoke pipe and power connections.

[Illustration: BURNS COAL ROASTER WITH BRICKWORK SETTING]

The front of the machine shown has a cast-iron plate having brackets
which support the cylinder front bearing, and double fire doors below
for the furnace and the ash pit. The movable part of the roaster is
hidden by the front head, a heavy casting which stands still except when
moved by hand through a half-turn for feeding and discharging.

The cylinder is driven by gears at the back, revolving constantly at
uniform speed. The inside of the cylinder is arranged with
reverse-spiral flanges which mix the coffee perfectly and make uneven
roasting impossible; and they discharge promptly every grain of coffee
when the front-head opening is turned to the lower position. The roaster
is generally operated with coal fuel, but can be used with gas by
installing a suitable burner under the cylinder.

[Illustration: OPEN PERFORATED CYLINDER WITH FLEXIBLE BACK HEAD]

COST CARD FOR ROASTERS

_Showing the value added to the cost of green coffee by
roasting_

By A.C. Aborn

BASIS: 16 percent Shrinkage.
3/4 cent a pound for Roasting.

Cost Green, Cost Roasted,
Cents per Lb. Cents per Lb.

5 6.85
5-1/8 6.99
5-1/4 7.14
5-3/8 7.29
5-1/2 7.44
5-5/8 7.59
5-3/4 7.74
5-7/8 7.89

6 8.04
6-1/8 8.19
6-1/4 8.33
6-3/8 8.48
6-1/2 8.63
6-5/8 8.78
6-3/4 8.93
6-7/8 9.08

7 9.23
7-1/8 9.37
7-1/4 9.52
7-3/8 9.67
7-1/2 9.82
7-5/8 9.97
7-3/4 10.12
7-7/8 10.27

8 10.42
8-1/8 10.57
8-1/4 10.71
8-3/8 10.86
8-1/2 11.01
8-5/8 11.16
8-3/4 11.31
8-7/8 11.46

9 11.61
9-1/8 11.76
9-1/4 11.90
9-3/8 12.05
9-1/2 12.20
9-5/8 12.35
9-3/4 12.50
9-7/8 12.65

10 12.80
10-1/8 12.95
10-1/4 13.10
10-3/8