in my experience led in the course of four months to a screw shaft
being seriously crippled.

I show you a section of a screw shaft found to be flawed, and which I
had broken under the falling weight of a steam hammer, when the
decided difference of the granules near the circumference from that in
the central part conveyed to me that it was weakened by treatment I
have referred to. I think more material should be left on the forging,
and the high finish with a little cold water should be discontinued.
Doing away with the outer bearing in rudder post is an improvement,
provided the bearing in the outer end of screw shaft in the stern tube
is sufficiently large. It allows the rudder post to have its own work
to do without bringing any strain on the screw shaft, and in the event
of the vessel's grounding and striking under the rudder post, it does
not throw any strain on the screw shaft. It also tends to reduce
weight at this part, where all the weight is overhung from the stern
of the vessel.

* * * * *




EXPERIMENTAL AID IN THE DESIGN OF HIGH SPEED STEAMSHIPS.

By D. P.


The achievement of one triumph after another in the matter of high
speed steamships, and especially the confidence with which pledges of