. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EXCAVATING MACHINERY USED IN LAND DRAINAGE. 25 SELECTION OF SCRAPER EXCAVATOR. In selecting a scraper excavator the purchaser, in addition to choosing the most desirable kind of power and the best means of moving over the ground in his particular case, must determine the length of boom best suited to his needs. Figure 2 is a diagram showing the relation between the length and angle of elevation of boom and the effective reach of machine. In this diagram all distances are referred to the heel of the boom. If it is desir
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EXCAVATING MACHINERY USED IN LAND DRAINAGE. 25 SELECTION OF SCRAPER EXCAVATOR. In selecting a scraper excavator the purchaser, in addition to choosing the most desirable kind of power and the best means of moving over the ground in his particular case, must determine the length of boom best suited to his needs. Figure 2 is a diagram showing the relation between the length and angle of elevation of boom and the effective reach of machine. In this diagram all distances are referred to the heel of the boom. If it is desired to refer horizontal distances to the center of the machine, the correction A must of course be added; this distance varies with the different makes of machine. The distance, B, of the heel of the boom above the ground, likewise varies slightly in different 10 15 20 25 30 35 40 45 SO 55 60 55 70 75 60 B5 SO 95 100 105 110 115 170 _L REACH OF BOOM IAI FEET FROM CENTER OF BOOM LUC AT VARIOUS ANCLES. To This Disfanc* add 'A" nhcn Disrance from Center of Machine is required. Fig. 2.—Diagram of scraper excavator, showing relation between the length and elevation of boom and. the effective reach of machine. To determine the maximum clearance of the bucket above the ground for different lengths and positions of boom, the distance B must be added to the vertical heights given on the right-hand margin of the diagram; and from this sum must be subtracted the distance C, which will depend entirely upon the type of bucket used. Thus, for a 70-foot boom elevated at an angle of 35°, the horizontal distance from the center of machine to the bucket would be 57 +A; and at that position of the boom the bucket would just clear a waste bank of a height 40 + B - C. THE DRY-LAND DIPPER EXCAVATOR. Excavating machines employing the same digging principle as used on the floating dipper dredge, but moving on land, either over or in. Please note that these images are extracted from s
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