EXCAVATING MACHINERY USED IN LAND DRAINAGE. 19 
house boat’ usually contains three rooms—a combined office and sleep- 
ing room for the foreman, a sleeping room for the two dredge oper- 
ators, and a large room for the rest of the crew. Another house boat 
is used for the galley and mess room. . On the two-story boats the 
first floor contains the galley and mess room and the upper floor the 
crew’s quarters. 
COST OF FLOATING DIPPER DREDGES. 
The cost of dredges advances rapidly as the size and capacity are 
increased. Dredges of the same rated capacity also vary. somewhat 
in cost with different manufacturers. All the machinery is usually 
made at the shops of the manufacturer. The material for the hulls 
may also be supplied by the manufacturer, but often the purchaser 
obtains lumber in the open market and builds the hull in the field. 
The cost of hauling the material and machinery from the railroad to 
the place of erection, the local price of labor, and the conveniences 
for housing and feeding the workmen are factors which enter into 
the cost of a machine of any type. 
Table 8 gives the approximate costs of the equipment for the 
various sizes of dredges of the type shown in Plate I as well as the 
weight and the number of cars required for shipping. To this cost 
must be added the cost of material for the hull, the cost of assembling, 
and of freight and hauling. | 
TABLE 8.—Weight and cost of dipper-dredge equipment, exclusive of hull. 
Weight. 
: Approxi- Cars re- 
ee oust mate cost quired for 
He ES *| (1919). | Telescope | Vertical | shipping. 
bankspuds.| spuds. 
Cu.yds.| Feet. | Pounds. Pounds. 
1 40 $12, 600 92, 000 85, 000 3 
13 50 18, 600 150, 000 125, 000 4 
2 60 25, 200 190, 000 160, 000 5 
23 70 31, 500 250, 000 220, 000 6 
3 80 37, 000 335, 000 300, 000 7 
4 85 50, 000 440, 000 400, 000 9 
5 95 GORO00 pees eae au ae a edn hee 
The number of cars required for shipping the hull material varies 
from one to three, depending upon the size of the machine. A three- 
fourths yard dipper dredge with 30-foot boom equipped with steel 
pontoon hull will cost about $12,000. 
METHOD OF OPERATING. 
With a floating dredge the construction, where practicable, should 
begin at the upper end of the ditch and proceed downstream. Some- 
times it is not feasible to transport the machinery and material to 
the upper end of the ditch and the dredge must then work upstream. 
i 
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