But quick generation of steam, and high pressures, necessitated a new type.
For that reason engines of this type should be run at high pressures.
High pressures of air or oxygen do not increase the intensity of luminescence (Dubois and Regnard, 1884).
The boilers are of the Scotch pattern that is usually employed for high pressures, as 160 or more lbs.
At these high pressures Perkins seems to have met with no other serious difficulty.
In large plants the boilers are usually of the water-tube variety, working at high pressures which may be increased at need.
In the field of steam practice, we know how great economy is realized by beginning work with high pressures.
To save room, boilers which have to make steam very quickly and at high pressures are largely composed of pipes.
Aimé Witz has always been an advocate of high pressures and of increased piston speed.
High pressures render it possible to employ poor mixtures and still insure ignition.