TERMS USED IN LOGGING 507 
Solid jam. 1. In river driving, a jam formed solidly and extending from 
bank to bank of a stream. (N. F.) 
2. A drive is said to be " in a solid jam " when the stream is full of logs 
from the point to wliich the rear is cleared to the mill, sorting jack or storage 
boom. (N. F.) 
Sorting boom. A strong boom used to guide logs into the sorting jack, to 
both sides of which it is usually attached. (Gen.) 
Sorting gap. See Sorting jack. 
Sorting jack. A raft, secured in a stream, through an opening in which logs 
pass to be sorted by their marks and diverted into pocket booms or the 
downstream channel. (Gen.) 
Syn.: sorting gap. 
Sound knot. A knot which is sohd across its face, as hard as the surrounding 
wood, antl so fixed that it will retain its j)lace in the piece. (Gen.) 
Spanish windlass. A device for moving heavy objects in logging. It con- 
sists of a rope or chain, within a turn of which a lever is inserted and power 
gained bj- twisting. (N. F.) 
Syn.: twister. 
Spar tree. See Head-spar tree. 
Spider. See Set gauge. 
Spiked skid. A skid in which spikes are inserted in order to keep logs from 
shding back when being loaded or piled. (Gen.) 
Spike knot. A knot sawed in a lengthwise direction. (Gen.) 
Syn.: horn knot, mule-ear knot, slash knot. (P. C. F.) 
Spike peddler. One who delivers spikes to .spikers in a railroad track-laying 
crew. (S. F.) 
Splash, V. To drive logs by releasing a head of water confined by a splash 
dam. (Gen.) 
Syn.: flood, sluice. 
Splash boards. 1. Boards placed temporarily on top of a rolling dam to 
heighten the dam, and thus to increa.se the head of water available for river 
driving. (N. F.) 
Syn.: slash boards. (N. W.) 
2. A false gate placed on the upstream side of a lift gate as an aid in 
raising the latter. (N. W.) 
Splash dam. A dam built to store a head of water for driving logs. (Gen.) 
Syn.: cut-away dam (E. C.), flood dam. (Gen.) 
SpUcer, n. One who splices cables on a logging operation. (P. C. F.) 
Split roof. A roof of a logging camp or barn made by laying strips split 
from straight-grained timber. The strips run from the ridge pole to the 
eaves, and break the joints ^vith other strips, as in a shingle roof. (N. F.) 
Spool donkey. A donkey engine equipped with a spool or capstan, instead of 
a drum. (P. C. F.) 
Syn.: dolbeer (Cal.), gj'psy yarder, donkey. 
Spool tender. 1. One who guides the cable on a spool donkeJ^ (P. C. F.) 
2. One who operates the loading drum on a donkey. (P. C. F.) 
Spot, V. 1. See Blaze. 
2. To place logging cars at a loading point or opposite a landing. (S. F., 
P. C. F.) 
