Chapter XLII.—MARINE ENGINES.
Marine engines are made in the following forms:
1. With a single or with two cylinders receiving live steam from the boilers, and exhausting into the atmosphere. These are termed high pressure engines, let the steam pressure be what it may. They are also, and more properly, termed non-condensing engines.
Fig. 3392.
In the small sizes, such as are used for launch engines, it is simply a non-condensing engine, with a link motion for varying the point of cut off as well as for reversing purposes. [Fig. 3392] represents an engine of this class constructed by Chas. P. Willard & Co.
The cylinder is what is called “inverted,” meaning that it is above the crank shaft.
The slide spindle or valve rod passes through a guide and connects direct to the link block or die, as it is sometimes called.
The thrust block is provided in the bearing of the crank shaft, and consists, as seen in the sectional view, of a series of collars on the crank shaft bearing.