mentioned. On this table boiler ends up to 8 ft. in diameter can be
turned up, the turning tool being carried by a slide rest, which is
mounted on the main baseplate, as shown, and which is adjustable
vertically and radially.

For cutting out flue holes a steel boring head is employed, this head
having a round end which fits into the center of the table. When this
work is being done the radial arm is brought into the lowest position.
Flue holes 40 in. in diameter can thus be cut out.

The machine has a 4 in. steel spindle with self-acting variable feed
motion through a range of 10 in., and the radial arm is raised or
lowered by power through a range of 2 ft. 8 in. When the arm is in its
highest position there is room for a piece of work 4 ft. high between
the circular table and the lower end of the spindle. The circular
table serves as a compound table for ordinary work, and the machine is
altogether a very useful one for boiler-makers.

The plate-bending rolls, which are illustrated on first page, are 10 ft.
long, and are made of wrought iron, the top roll being 12 in. and the
two bottom rolls 10 in. in diameter. Each of the bottom rolls carries
at its end a large spur-wheel, these spur-wheels, which are on opposite
sides of the machine, each gearing into a pinion on a shaft which runs
from end to end below the rolls, and which is itself geared to the shaft
carrying the belt pulleys, as shown. This is a very simple and direct
mode of driving, and avoids the necessity for small wheels on the rolls.
There is no swing frame, but the top roll is arranged to draw through
between the arms of the spur-wheels, a very substantially framed machine
being thus obtained.