. Transactions. . Shovel Underground Length of Hr. and 12 all Tests Height of Car, 42 Tn. c 5 g. t> o w * 1 4 E Z 3 12 13 .14 15 4 5 6 7 8 9 10 11 Distance Ore is Thrown, in Feet Fig. 29.—Effect of distance thrown on number of shovels per minute. seems to be the best distance to maintain between car and ore pile, fora man to work to the best advantage. Due to the height of the car, thecapacity of a shoveler is decreased, as compared to his capacity in shovelsper minute, when loading into a wheelbarrow. This decrease in shovel-ing speed amounts to about 8 per ce
. Transactions. . Shovel Underground Length of Hr. and 12 all Tests Height of Car, 42 Tn. c 5 g. t> o w * 1 4 E Z 3 12 13 .14 15 4 5 6 7 8 9 10 11 Distance Ore is Thrown, in Feet Fig. 29.—Effect of distance thrown on number of shovels per minute. seems to be the best distance to maintain between car and ore pile, fora man to work to the best advantage. Due to the height of the car, thecapacity of a shoveler is decreased, as compared to his capacity in shovelsper minute, when loading into a wheelbarrow. This decrease in shovel-ing speed amounts to about 8 per cent, per foot of height. The best typeof car for a shoveler to use holds about a ton of ore, is as low as is consist-ent with good design, certainly not over 45 in. in height, and is equippedwith roller bearings, which should be kept in the best of condition. Cars G. TOWNSEND HARLEY 169 much larger than this are too hard to tram and cars much smaller use uptoo much of the shovelers time tramming back and aq s;nu|iA| Jsd pssdg 3u;lulucjj_ sSejsav — ■a h Data used-Rate o£ Travel at Full Spe180 Ft. per Mln. At Start, Full Speed is attained in 2At End of Run, Stop is made in 8 FTime to Dump Car etc.,1 SeTramming with Car Underground CM -O E spuooas puB so}nut|/\j ui 3ui!_L SuidixiriQ pue §u;aiUUBJJ_ Fig. 29 shows the effect of having to throw the ore a greater distancethan 4 ft. into the car, for a given length of job, using a No. 4 D-handleshovel. For every additional foot between the car and the ore pile, the 170 A STUDY OF SHOVELING height of the car remaining constant, the decrease in shoveling speedamounts to about per cent. In Fig. 30, chart A shows the time consumed in tramming, dumping,and returning with the car, over various distances. Chart B shows the i — ■aa s •o oa *;t> .2 •s a > O) O i-, ! 1 •5 >-■ 2 aw i J 1 ! 3 3 !K o-H t. ^* a *-* 0 ~ > u o a £ aa a 7) » / / 1 / / d Z o o Qc Z2
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
