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EXCAVATING MACHINERY USED IN LAND DRAINAGE. 43 
which depends upon the kind of bucket used. Thus for a 70-foot 
boom elevated at an angle of 35 degrees the horizontal distance from 
the center of the machine to the bucket would be 57-L-A, and at that 
position of the boom the bucket would just clear a waste bank of the 
height 40+-6-C. In using the diagram for nonrotating excavators 
the distance A is not added, since the boom of this type of machine 
swings at its pivot. Table 17 gives the approximate distances A and 
B in figure 2 for the various sizes of machines on the different styles 
of mountings. The distances will vary shehtly for different makes 
of excavators. 
TABLE 17.—Limitations of operation of drag-line excavators. 
Size of | Length | Diameter of yi mines Distance | Distance 
bucket.| of boom. | turntable. Type of mounting. Al Bl 
Cu.yis.| Leet. Feet. in. Heche Na Heche 41. 
3 30 2M Pa al Oe fs) eo Ne ees Ce as Aes ae ee te Ae es ee eS sat ea eet 24-3 4-43 
1 40 DUT es By al NAYRER HC=) Bae SL aE Sa otk eT es A Bia <i BG 
1 42 i Caterer ye GLAS sp ae 2 Bee oy ACS Sino 
1 42 7 Ski Stam daenollens een cages ois eee mene ae Sha ARO) 
13 45 Oe GelaCaterpulll ary ey selene ee ees HOE C228 O28 
1s 45 FeGn | iokrd syanderollersmsy ass ais yes see eee hoe ® 7 #4 
2 60 14 CEE VCHSNEN OU Ray ish a en A i Da La ee i 6 @) 55) 
2 60 14 Skadsyandinollerseec ays-s eee eee eee (6 Gye 5 
2 50 1D pale (ODS espe otras Sects areas Alans ae Ri Ura ere ea RRNA 9 6G GreenG 
2 50 15 AUIS Bes rage a cet Dg 10 Aaa 
2h 85 20 Skidstanditollerssss seater > hee Sky ee ee oe 12) e2 Cates 
2h 85 20 SESTULC KS ee eee a eat sa eae cee e ep gin tes ye nly Oe a NP) RG 
3 60 17 Ni eau ace os eee a IMG I er) hea Oh le ta Ad tere CL 10 8 4 9 
3 60 17 Skid svangdsrollenss4ee se hese ce ee eee an ee ll 8 Ul 
3h 80 OY ia Soa Gp Rg Soe ee ane ie ee Sol Be 1 8 
3h 100 DAG |e Ol Opn a5 8 ee rei ie ERPS faa A Ne Od ie, EEN hs 2) WMO) 
33 125 24 PING UT CS eget see ae Uae ete Taye ee epee a A 12 10 13 
4 80 24 kad am Gero Weise sae ne spa ane ne ae ee eh a8 125576 8 
4 100 pa Coan (en eee GUO SS i a PTR car Ee re Nears et ware, See 15 8 6 
1 See figure 2. 
The clearance distance (’ (Fig. 2) varies with the size of bucket and 
size of sheaves used. Table 18 gives the approximate values of C 
for the various sizes of bucket shown in Plate VII, Figure 1. 
TasleE 18.—Clearance of buckets for drag-line excavators. 
Size of = jae Size of in " 
itiaicete Distance C.! | SE. Distance C.1 
| 
Cu. yds. Feet. ne Grleey ase Feet. 
4 i) S| 3 15} to 16 
3 124 3h 15% to 164 
1 12 to 123 4 174 
13 12} to 13 4h 184 
2 144 to 15 5 19 to 23 
23 14% to 15} 
1 See figure 2. 
The factor governing the size of the ditch which a certain machine 
an dig is not ability to excavate, but, rather, to dispose of the mate- 
rial excavated, especially where the ditch is deep and the yardage 
per linear foot relatively large. An experienced runner can drop 
