APPLES 
Fig. 8. 
A Stump Puller That Lifts the Stump 
Vertically Out of the Ground. 
The Donkey Engine 
More land has been cleared in West- 
ern Washington by means of the donkey 
engine than by any other agency since 
this method came into use. As a rule in 
Washington outfits for clearing have been 
used-up logging rigs, and as a conse- 
quence, results have been less favorable 
than they otherwise might have been. 
Equipment should consist of a large dou- 
ble drum engine (10x12 to 12x14 cylin- 
der) with tackle consisting of 1,000 feet 
of 14-inch main cable, 2,000 of 5-inch 
haul-back line, four 1-inch guy lines, two 
10-inch pole blocks, four 8-inch blocks for 
haul-back line in the field, lead lines, 
chekers, extras and tools. 
Logs and stumps should be piled as 
high as possible for burning, hence a gin 
pole 60 to 100 feet high is most com- 
monly used. The crew is made up of en- 
Lit 
Fig. 9. <A Tall Gin Pole and a Good Pile That 
Will Burn Well. 
gineer, fireman, pile man (except: where 
automatic self-releasing choker is used), 
hook tender, and assistants. Tracts to 
be cleared should be slashed and burned 
and stumps previously blasted so as to 
split and loosen them. The gin pole can 
be set in the center of a 10-acre tract, 
or at a center where not over 500 feet 
of haul is made. 
Gin pole and engine are guyed to 
stumps or “dead men” sunk four to six 
feet deep. ‘The accompanying diagram 
illustrates method of setting. 
The following specifications and esti- 
mate for a donkey engine outfit are taken 
from the article by Harry Thompson in 
U. S. Bureau of Plant Industry, Bulletin 
No. 239. 
A compound-geared yarder, with two 
speeds to the main drum, giving approxi- 
mately 100 and 250 feet per minute, with 
the haul-back geared to run at 300 to 
350 feet per minute, is required. The 
cylinders should be 9x10 or 10x12 feet. 
The hauling drum should be fitted with a 
steam friction. The boiler should be ex- 
tra large. There should be 1,000 feet of 
14-inch main line of six strands of 19 
wires each and 2,000 feet of 5¢-inch haul- 
back line of six strands of 19 wires each. 
Estimate of Cost of Donkey Engine Outfit 
ATURE AROS CAINE AIOTUNE sons Ah sraiccoses ust oeosy. arth oh sienna clan eR bo oo cated ih AR Oe $3,500 
RUPE TR WEIN ces caleen stead dacs secancavestuteeivceaeos ea kl Lee ee ne th Nie, 200 
BEML DIN 96 sl csorisneaepensi acna sedis Sainsn sts he ccastitison edaiedghs hence ac ts Mote 150 
BUTTE: TOG FI BAG re oid eee a In nee Bt i te ie te ca ee Re 75 
Six self-releasing chokers (*%4-inch, %-inch and BORN INW 5 occasesasidkaiut cent x Geadauantooues cee 60 
Four haul-back blocks, hooks and swivels.......-.00..-0cccccccceeeceeooeooooeeooooooe 70 
Four t-inch guy lines, 250 feet each ncci62 oo o.co.ccecsiccececescchsceceeel oeccosecccccccsc cet 150 
One lead: block for haul-back Mme. c._......cccc ccs cevsccsescescececoecoecce cece ooooce occ coe coecce. 35 
PUTOCEPECTSIS TIGL CI esac 5800 esed algun coer vackicctd Suazinac. ded, areca lodacniectc bistable ocnmteticc agen.» 10 
Tools,, extra Rooks,- DOCKS, @t@.....2..2..-.-.--<s0cec-cseeoneceasedeseceecdeceecedcecoocceeeoseccceecccecccclc 150 
