There is an
advantage in cost and with less risk in undiscovered flaws in
material.
An interesting change has been made in the steam pipes. Cases of
copper steam pipes bursting when subjected to high pressure have not
been infrequent, and Mr. A. Laing, the engineering director on the
Fairfield Board, with characteristic desire to advance engineering
practice, has been devoting much attention to this question lately. He
has made very exhaustive tests with lap welded iron steam pipes of all
diameters, but principally of 10 in. diameter and 3/8 in. thickness of
material, made by Messrs. A. & J. Stuart & Clydesdale, Limited, and
the results have been such as to induce him to introduce these into
vessels recently built by the company. It may be stated that the pipes
only burst at a hydraulic pressure of 3,000 lb. to the square inches.
The Tynwald was tried on the Clyde about a month ago, and on two runs
on the mile, the one with and the other against the tide, the mean
speed was 19.38 knots--the maximum was 191/2 knots--and the indicated
horse power developed was 5,200, the steam pressure being 160 lb., and
the vacuum 28 lb. Since that time the vessel has made several runs
from Liverpool and from Glasgow to the Isle of Man, and has maintained
a steady seagoing speed of between 18 and 19 knots.
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