per minute. The crane was constructed by Messrs.
Stothert & Pitt, of Bath, to the order of the Crown agents for the
colonies, and we understand that the design and construction have
given complete satisfaction to Sir J. Coode, the engineer to the
harbor works, under whose supervision the crane was
constructed.--_Engineering._
* * * * *
IMPROVED STEAM-BOILER.
An improvement in steam-boilers, best understood by reference to the
ordinary vertical form, has been introduced by Mr. T. Moy, London.
Here the flue is central, and, as shown in the accompanying
illustration, is crossed by a number of horizontal water-tubes at
different heights. The ends of these tubes are embraced, within the
steam chamber, by annular troughs. At the top domed part of the boiler
are two annular chambers, the outer one being intended to receive the
water upon entry from the feed-pump, and to contain any sedimentary
deposit which may be formed. The water next passes, by the pipe, _a_,
in the figure, into the inner chamber, surrounding the end of the
uptake flue, whence it flows through the pipe, _b_, down into the
first of the annular troughs above mentioned, and afterward overflows
these troughs in succession until it reaches the bottom. Mr.
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