538 INDEX 
Dams, logging, pier, 399. 
pile, 392. 
rafter or self-loading, 391. 
roll, 389. 
self-loading or rafter, 391. 
sites for, 388. 
sluice gates for, 393, 393*, 394*, 396*, 397*. 
types of, 389. 
Davis ocean-going log raft, 429, 429*. 
Deadening timber, 100. 
Decker log loader, 363, 364*. 
Decking logs, 137*, 138. 
Defects, log, crook or sweep, 113. 
crotches or forks, 113. 
sweep or crook, 113. 
Depreciation, barns, canvas, 67. 
camp cars, 69. 
motor truck roads, 202. 
slide, pole, 266. 
steam log hauler, 180. 
railroad, stringer, 282. 
tractors, 208. 
two-sleds, 163. 
Dogs, logging, 151, 151*. 
Dog- warp, 415. 
Douglas fir (see fir, Douglas). 
Draft power, animal, 129. 
Drill, churn, 305. 
hand, 306. 
jumper, 305. 
Drilling rock, 304. 
Drive, log, alligator for towing logs, 417. 
boom companies, 408. 
conduct of a, 408, 414. 
floating and rafting logs, 383. 
headworks for towing logs, 416, 416*. 
improvement of stream beds and banks, 398. 
labor on, 413. 
large streams, 417. 
log carriers used in Canada on, 398. 
picking rear, 416, 418. 
requirements for a driveablo stream, 387. 
St. John's River, 421. 
season, 407, 414. 
small streams, 414. 
sorting and storage facilities for a, 402. 
storage reservoirs, 388. 
union, 408. 
Driveable stream, requirements for, 387. 
Drivers, log, 413. 
Drumming, 149. 
Dry rooms, logging camps, 78. 
Dudley, 340. 
Dump, log, 375, 376*, 378*. 
Dunnage road, 317*, 318. 
Duplex aerial cubleway system, 226. 
Dust road, 317*, 318. ' 
Dynamite, blasting rock with, 306. 
blasting stumps with, 311. 
breaking down landings with, 415. 
