horse power, with injection condenser, working the bucket chain by
means of belts and wheel gearing, as shown on Fig. 2. A marine boiler
of 46 square meters (495 square feet) heating surface and 6
atmospheres (90 lb.) working pressure, supplies steam. In this vessel,
it may be added, there is a cabin for the crew.

The dimensions of the vessels are as follows; Extreme length, 25
meters (82 ft.); breadth, 4.5 meters (14 ft. 9 in.); depth (moulded),
2.7 meters (6 ft. 6¾ in.); average draught of water, 1.4 meters (4 ft.
7 in.); space between the ships, 6.55 meters (21 ft. 6 in.) The iron
structure connecting the ships is composed of four upright box-form
stanchions on both ships, connected at the top by two strong box
girders with tie pieces supporting the main framing. This main
framing, also of the "box girder" form, is strengthened with angle
irons and braced together at the tops by a platform supporting the
gearing of the bucket chains, as shown on Fig. 5. The buckets have a
capacity of 160 liters (5.65 cubic feet) and the speed in travel is at
the rate of 25 to 30 buckets per minute, so that with both ladders
working, 50 to 60 buckets are discharged per minute. The top tumbler
shaft is placed at a height of 13 meters (42 ft. 8 in.) above the
water line (Fig. 4), and the dredge conduit has a length of 50 meters
(164 ft.), Fig. 1. The shooting is done at a height of 8.5 meters (27
ft. 10 in.) above the water line, and the shoot catches the dredged
products at a height of 10.5 meters (34 ft. 5 in.) above the water
line, the sliding gradient being 4 to 100. The dredge conduit is
carried by timberwork resting on two of the upright box form
stanchions.

[Illustration: IMPROVED FLOATING ELEVATOR AND SPOIL DISTRIBUTOR.]