or and Halcon, which have lately been constructed
by Messrs Yarrow & Co., of Poplar, for the Spanish government. They
are 135 ft. in length by 14 ft. beam, being of the same dimensions as
No. 80 torpedo boat, lately completed by the above firm for the
Admiralty, which is the largest and fastest torpedo-boat in the
British navy.

[Illustration: TORPEDO BOATS FOR THE SPANISH GOVERNMENT.]

The general arrangement of these torpedo boats is sufficiently clear
from the illustrations to need but little description. Suffice it to
say that the engines are of the triple compound type, capable of
indicating 1,550 horse power, steam being supplied by one large
locomotive boiler, which our readers are already aware is in
accordance with the usual practice of the makers, as, by using a
single boiler, great simplification of the machinery takes place, and
considerably less room is occupied than if two boilers were adopted.
It is worthy of record that although in some torpedo boats, and indeed
in a great number of them, trouble has been found with the locomotive
type of boiler, still we have no hesitation in saying that this is due
either to defective design or bad workmanship, and that, if properly
designed and constructed, such difficulty does not occur. And it is a
fact that Messrs. Yarrow & Co. have already constructed a great number
of locomotive boilers of the exceptional size adopted in these two
Spanish boats, and they have turned out in every respect, after actual
service, perfectly satisfactory.

The forward part of the boat is provided with two torpedo-ejecting
tubes, as usual, and near the stern, on deck, it is proposed to place
turntables, with two torpedo guns for firing over the sides, as
already adopted by several governments. The trials of the Azor took
place about two months since, giving a speed during a run of two hours
and three quarters, carrying a load of 17 tons, of 24 knots (over 271/2
miles) per hour. Since her trial she has steamed out to Spain, having
encountered, during a portion of the voyage very bad weather, when her
sea going qualities were found to be admirable.

The Halcon, whose official trials took place lately, obtained a speed
of 23.5 knots, carrying a load of 17 tons. It may be remarked that a
speed of 24 knots, in a boat only 135 ft in length, under the Spanish
conditions of trial, is by far the best result that has ever been
obtained in a vessel of these dimensions There is, however, no dou