| 28 | 377 | 27.272| | 25.138
| | | | | | 25.248|
5 | 130 | 32 | 28 | 375 | 23.225| | 25.248
| | | | | | 25.248|
6 | 130 | 32 | 28 | 377 | 27.272| |
+------+----------+---------+------------+-------+-------+-------
Means.| 130 | 32 | 28 | 2741/2 | | | 25.101
| | | | | | knots
-------------+----------+---------+------------+-------+-------+-------

--_Engineering_.

* * * * *

SOME RECENT HIGH-SPEED TWIN SCREWS.

[Footnote: A paper recently read before the Institution of Naval
Architects, London.]

By E.A. LINNINGTON.

One of the most interesting and valuable features in the development of
naval construction in recent years is the great advance which has been made
in the speeds of our war ships. This advance has been general, and not
confined to any particular vessel or class of vessel. From the first class
armored fighting ship of about 10,000 tons displacement down to the
comparatively diminutive cruiser of 1,500 tons, the very desirable quality
of a high speed has been provided.

These are all twin screw ships, and each of the twins is driven by its own
set of engines and line of shafting, so that the propelling machinery of
each ship is duplicated throughout. The speeds attained indicate a high
efficiency with the twin screws. In all ships, but more especially in high
speed ships, success depends largely upon the provision of propellers
suited for the work they have to perform, and where a high propulsive
efficiency has been secured, there is no doubt the screws are working with
a high efficiency. The principal purpose of this paper is to record the
particulars of the propellers, and the results of the trials of several of
these high speed twin screw ships. The table gives the leading particulars
of several classes of ships, the particulars of the screws, and the results
obtained on the measured mile trials from a ship of each class, except C.
The vessels whose trials are inserted in the table have not been selected
as showing the highest speeds for the several classes. Excepting C, they
are the ships which have been run on the measured mile at or near the
designed load water line. On light draught trials, speeds have bee