EXPLANATION OF THE PLATES.
351
There will, I think, be some advantage in making the pistons act together,
because the effect will be as great as by dividing it, supposing both methods to be
perfect; and in acting together, there would be less interference of the motion of
the one with that of the other. The slide would be best moved from curved teeth
on the beams. See art. 481.
For the proportions and construction of the boiler, see art. 244, 227, 278, and
522—526; for the engines, see art. 271—380; and for the power required, see
art. 590.