which project two arms, each provided with a screw that serves for the
lateral adjustment of the gun. These screws are so arranged as to allow
for an oscillating motion of the gun through any distance up to 15 deg.
The tripod mounting, used for naval as well as land purposes, is shown
in Fig. 2, which illustrates the two barrel gun complete. The five
barrel gun, Fig. 3, is shown mounted on a similar tripod. The length of
this weapon over all is 53.5 inches, the barrels (Henry system) are 33
inches long, with seven grooves of a uniform twist of one turn in 22
inches.

[Illustration: Fig. 2.--TWO BARREL GARDNER GUN.]

Gardener's five barrel gun in the course of one of the trials fired
16,754 rounds with only 24 jams, and in rapid firing reached a maximum
of 330 shots in 30 seconds. The two barrel gun fired 6,929 rounds
without any jam; the last 3,000 being in 11 minutes 39 seconds, without
any cleaning or oiling.--_Engineering_.

[Illustration: Fig. 3.--FIVE BARREL GARDNER GUN.]

* * * * *




CLIMBING TRICYCLES.


The cycle trade is one which has been developed with great rapidity
within the last ten years, and, like all new industries, has called