490 APPENDIX 
Horse dam. A temporary dam made by placing large logs across a stream, 
in order to raise the water behind it, so as to float the rear. (N. F.) 
Horse logs, to. In river driving, to drag stranded logs back to the stream 
by the use of peaveys. (N. F.) 
Hot logging. A logging operation in which logs go forward from stump to 
mill without pause. (Gen.) 
Hot skidway. A skidwaj^ from which logs are immediately loaded. (N. W.) 
Hovel, n. A stable for logging teams. (N. W., L. S.) 
Ice a road, to. To sprinkle water on a logging road so that a coating of ice 
may form, thus facilitating the hauling of logs. (N. F.) 
Ice box. See Sprinkler. 
Ice guards. Heavy timbers fastened fan shaped about a cluster of boom 
piles at an angle of approximately 30 degrees to the surface of the water. 
They prevent the destruction of the boom by ice, through forcing it to 
mount the guards and be broken up. (N. E.) 
Incline, n. A portion of a logging railroad, the grade of which is too steep 
for the operation of locomotives, and up or down which the log cars are 
raised or lowered by means of a cable and power. When logs are hauled 
up grade the incline is sometimes called a hoist. (Gen ) 
Jack, n. 1. A type of jack screw sometimes used for rolling logs off from the 
right of way, where railroad grading is being done by hand. The jack 
screw was formerly used to shift logs on a landing when cars were being 
loaded by hand. (P. C. F.) 
2. In aerial logging, a shoe which rests on a guy line and supports the 
loading block. (P. C. F.) 
Jack chain. An endless spiked chain which moves logs from one point to 
another, usually from the mill pond into the sawmill. (Gen.) 
Syn.: jacker chain (Gen.), bull chain, log haul chain (P. C. F.). 
Jackpot, n. 1. A contemptuous expression appUed to an unskillful piece of 
work in logging. (N. F.) 
2. An irregular pile of logs. (App.) 
3. A bad slash. (N. W.) 
4. Lodgement of one or more trees in another in felling. 
Syn.: siwash. (P. C. F.) 
Jack works. See Loading jack. 
Jam, V. To form an obstruction of logs in a stream. (N. F., E. C.) 
Jam, n. A stoppage or congestion of logs in a stream, due to an obstruction 
or to low water. (Gen.) 
Jam cracker. See Head driver. 
Jam hook. See Swamp hook. 
Jammer, n. 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 McGiffert type. (Cal.) 
Jam, to break a. To start in motion logs which have jammed. (Gen.) 
Jay hawk, to. To strip one 4-foot length of bark from a tanbark oak, leaving 
the tree standing. (P. C. F., N. W.) 
Jay hole. On steep skidding roads, a place of refuge for the teaija when the 
turn of logs has attained high speed. (App.) 
