[Illustration: BRIDGE OVER THE RIVER ADIGE, AT VERONA.]

The arched girders are connected together, in the central portion, by a
system of diagonal bracing, as is shown on Figs. 2 and 7. The carriage
road on the platform consists of buckled plates resting on transverse
girders spaced 6 ft. 6 in. apart, and covered with road metal, and for
the sidewalks checkered plates are used. The ironwork in the bridge
weighs 400 tons, and cost 8,400 _l._; the abutments cost 3,600_l._,
making the total outlay on the structure 12,000_l_. The bridge was
tested by a uniformly distributed load of 82 lb. per sq. ft., and under
this stress the arched girders deflected 1.06 in. The horizontal and
vertical oscillation of the bridge, which were carefully observed and
graphically recorded by special instruments, were very slight. The
engineer of the work was Mr. G.B. Biadego, of Genoa.--_Engineering_.

* * * * *




PUMPING MACHINERY.

[Footnote: A paper read at the Montreal Meeting of the British
Association.]

By E.D. LEAVITT, JR., Cambridgeport, Mass.

MINE PUMPING MACHINERY.