FOREST TERMINOLOCV 33 



2. In aerial logging, a shoe which rests on a guv line and supports the load- 

 ing block. (P. C. F.) 



Jack, V. In lumber piling, to pass up boards to the piler on top of the lumber 

 stack. (Gen.) 



Jack chain. An endless spiked chain which moves logs from one point to 

 anotlier, usually from the mill pond into the sawmill. (Gen.) 

 Syn.: jacker chain (Gen.), bull chain, log haul chain (P. C. F.). 



Jacker. Sec Pond man. 



Jacker chain. See Jack chain. 



Jackerman. Sec Pond man. 



Jack ladder. See Log haul-up. 



Jackpot, n. 1. A contemptuous expression applied to an unskillful piece of 

 work in logging. (N. F.) 



2. An irregular j)ile of logs. (App.) 



3. A bad slash. (N.W.) 



4. Lodgment of one or more trees in another in felling. 

 8yn.: siwash. (P. C. F.) 



Jack slip, n. See Log haul-up. 



Jack works. (Log.) See Loading jack. 

 (Lum.) See Log jack. 



Jam, n. A stoppage or congestion of logs in a stream, due to an obstruction or 

 to low water. (Gen.) 



Jam, V. To form an obstruction of logs in a stream. (N. F., E. C.) 



Jam cracker. See Head driver.. 



Jam hook. See Swamp hook. 



Jam, to bi'eak a. To start in motion logs which have jammecL (Gen.) 



Jammer, ii. 1. An improved form of gin, mounted on a movable framework, 

 and used to load logs on sleds and cars by horse-power. (N. F.) 

 2. A power log loader, usually of the IV^Giffert type. (Gal.) 



Jay hawk, to. To strip only one 4-foot length of bark from a taubark oak, 

 leaving the tree standing. (P. C. F., N. W.) 



Jay hole. On steep skidding roads, a place of refuge for the team when the 

 turn of logs has attained high speed. (App.) 



J.hook, v. A hook, with a recurved head, to each end of which a grab is at- 

 tached by a short chain. The J-hook is fastened to the top of the forward 

 log of a turn on a skipper road and serves as the point of attachment for the 

 draft. If the logs start to run, the draft animals can be automatic:illy freed 

 by turning them at right angles to the road. (App.) 



Jihoo, t'. To remove .-i dog from a log. (N. W., L. S.) 



Jig, V. Sec .ligger. 



Jigger, r. To jiull ;i log liy liorse-power over a level place in a slide. (Gen.) 

 '"'.^"•: .iJK> ^«zy haul, to (Gen.), trail (R. M. F.) 



Jig team. A team of horses used to jigger logs. (App.) 



Jim binder. Sec Binder. 



Jim crow. A tvpe of rail bender used for bending or straightening steel rails. 

 (Gen.) 



Jim crow loads. A logging car or truck loadtMl witli. a log so largo tlmt o»« 

 constifiitcs a load. (P. C. F.) 



Jobber, n. A logging contractor or sul (contractor. (Gen.) 



Jobber's sun. A term applied to the moon in a jobber's or contractor's logging 

 camp, on account of the eiirl\' Mini late hours of commencing and ending work. 

 (N. W., L. S.) 



Joiner. See Matcher. 



Joint, II. A section of a raft. (-E. C.) 



