steel chains, 10" x 12" double cylinder hoisting
engine, and 61/4" x 8" double cylinder reversible crowding engine. The
drums are fitted with friction clutches. Owing to the great distance at
which the dipper is handled, its size is reduced, and because it swings on
the arc of so large a circle the capacity of this machine is only one-half
of that of the No. 1 excavator built by the Osgood Dredge Company.
Nevertheless it will do the work of from 75 to 100 men, since its capacity
is from 800 to 1,000 cubic yards per day, the amount of rock _uncovered_
depending, of course, upon the depth of earth overlying it. The excavator
will dump 30 feet from the center line of the car, and 26 feet above the
track, which is laid on the rock. Total weight about fifty tons. The crew
required for its operation consists of 1 engineer, 1 fireman, 1 craneman,
and 4 to 5 pit men to tend jacks, move track, etc.

In the illustration the boiler connections are omitted, also the housing
for the protection of the crew. The design is characterized by the evident
care which has been bestowed upon securing simplicity and
durability.--_American Engineer._

* * * * *

THE OSGOOD EXCAVATOR.

At a recent meeting of the Engineers' Club of Philadelphia, Mr. John C.
Trautwine, Jr., exhibited and described drawings of a large land dredge
built by the Osgood Dredge Co., of Albany, New York, for the Pacific Guano
Co., to be used in removing 8 to 15 feet of material from the phosphate
rock at Bull River, S.C.

The more prominent features of the machine are the car-body, the water
tank, boiler and engine, the A frame (so-called from its slight
resemblance to the letter A), the boom, the dipper-handle; and the dipper,
drawings of which were shown and described in detail.

Before the excavation is begun, the forward end of the car (the end
nearest the dipper) is lifted clear of the track by means of 3
screw-jacks. When the machine has excavated as far in advance of itself as
the length of the boom and that of the dipper-handle will permit, say
about 8 feet, the car is again lowered to the track, the screw-jacks
removed, and the car is moved forward about 8 feet by winding the rope
upon the drum, the other end of the rope being attached to any suitable
fixed object near the line of the track. The forward end of the car is
then again lifted by means of the 3 screw-jacks, and the digging is
resumed. The machine cuts a ch