93
Puentes. 112
De Ban. 113
St. Chamond. 114
Alicante. 154
Hamiz (Algeria)--failed. 157
Habra (Algeria)--failed. 185
A diagram comparing the section derived from Molesworth's formula and
those of Furens, Gileppe, Vyrnwy, and Quaker Bridge, is given at Fig. 20,
the limit of pressure assumed for the masonry being 93 lb. per square
inch, which is that of the Furens, the Gileppe being 88.
* * * * *
NEW DREDGING MACHINERY.
We illustrate the new dredger Ajax, recently built for Mr. Geo. F. Smith,
of Stockton, Cal.
The dredger has now been working for two weeks at Wakefield, and, we are
informed, is giving entire satisfaction; having been repeatedly timed to
be discharging clay at the rate of 220 cubic yards per hour.
[Illustration: THE NEW DREDGER AJAX.]
The Ajax is almost a duplicate of the last dredger designed by Mr. Ferris
for levee building on Roberts Island, with such modifications and
improvements as have suggested themselves in the two years it has been
working.
The hull, oval in plan, is 36 ft. 10 in. by 60 ft. over all; it has four
solid fore and aft bulkheads, and a well hole 5 x 12 ft. at one end for
the bucket ladder.
The main engine is 10 x 24, operating, by bevel gearing and a 31/2 in.
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