. f^'" â Seefior? of £?'&/? ca^sf'-ac'^c/' 61/ £>r</ /~a'?d' Mt3c/?"7& perfect. Fig. 8 shows one of the latest and best types of this class of dredge, which is beginning the construction of a wide bottom ditch. A similar machine, but excavating a narrow bottom ditch, is shown in Fig. 9. An excavator of this type works most efficiently upon dry soil and where the area to be drained is flat. Work can be done on wet land by starting at the outlet and digging up stream, although the cost and labor of planking often renders this un- economical. Such a machine is not pr
. f^'" â Seefior? of £?'&/? ca^sf'-ac'^c/' 61/ £>r</ /~a'?d' Mt3c/?"7& perfect. Fig. 8 shows one of the latest and best types of this class of dredge, which is beginning the construction of a wide bottom ditch. A similar machine, but excavating a narrow bottom ditch, is shown in Fig. 9. An excavator of this type works most efficiently upon dry soil and where the area to be drained is flat. Work can be done on wet land by starting at the outlet and digging up stream, although the cost and labor of planking often renders this un- economical. Such a machine is not practical in a heavily timbered country or where large boulders and ledges of rock abound. THE SELECTION OF A DREDGE. The cost of construction of a dredge varies from $5,000 to .$10,000, depending upon its size and capacity. It is clearly evident that a ditch must be of a sufficient size to warrant the use of such a machine in its excavation. Where the ditch has a length
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdrainag, bookyear1910
