[Illustration: IMPROVED BOILER PLATE BENDING ROLLER.]

The chief novelty in the machine is the additional roll provided
under the ordinary bottom rolls. This extra roll, which is used for
straightening old plates and for bending small tubes, pipes, etc., is
made of steel, and is 7 in. in diameter by 5 ft. long. It is provided
with a swing frame at one end to allow of taking-off pipes when bent,
etc., and it is altogether a very useful addition.

The machine we illustrate weighs 11 tons, and is all self-contained, the
standards being mounted on a strong bedplate, which also carries the
bearings for the shaft with fast and loose pulleys, belt gear, etc. Thus
no foundation is required.--_Engineering_.

* * * * *




MODERN ORDNANCE.

[Footnote: A paper read Feb. 8, 1882, before the Society of Arts,
London.]

By COLONEL MAITLAND.


A great change has lately been taking place throughout Europe in the
matter of armaments. Artillery knowledge has been advancing "by leaps
and bounds;" and all the chief nations are vying with each other in the