Chicago : Engineering and Contracting Pub. Co. · leaf 71
out the minimum size of ditch which canbe practically excavated in this manner. Figure 2 shows a ditch which may be ex-cavated by the use of two sizes of elevators.The first 2 ft. in depth is excavated with a The daily output of an elevating grader asgiven in Gillettes Handbook of Cost Data,shows… … Fig. 3. 15-ft. elevator starting the cut along the out-side of the ditch and working toward thecenter. The last 2 ft. is then excavated byan 18-ft. elevator, leaving a berm of about 2ft. on each side. Figure 3 represents a ditch which is deeperthan can be handled ordinarily with an clevat-
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