File:Canadian forest industries 1908 (1908) (20531737531).jpg

Title: Canadian forest industries 1908
Identifier: canadianforest1908donm (find matches)
Year: 1908 (1900s)
Authors:
Subjects: Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries
Publisher: Don Mills, Ont. : Southam Business Publications
Contributing Library: Fisher - University of Toronto
Digitizing Sponsor: University of Toronto

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Yarding to Long Haul Engine (Slack-Rope System.) As with other wire rope engines, it is the length of haul rather than the pay load that influences the required engine power. Capacity should wherever possible be secured by increasing the load rather than the number of trips. Here the excessive rope weight and friction, the large size of drums required to hold the rope, the large boiler capacity requisite for long hauls, are all factors necessitating great size and power of machine. For example, an efficient engine for a haul of 4,000 feet should have a boiler at least 60 inches x 120 inches, with 10-inch x 12-inch cvlinders, day, depending on size of plant and working conditions. With suitable engine and other equipment the installation and operation of the road engine is to the experienced a simple matter; although the road or slide permits ample opportunity for exercise of judgment in selection of course and amount of labour to be bestowed thereon. The outhaul line, as in other slack line machines, must pass through tail blocks; furthermore, it will often leave the course of the road and pass through the woods at some distance, thus to be out of the way of operations or to secure a better or (in the event of curves in the main
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Side Lining with a separate Engine Mounted upon Sled or Runners. and would weigh from sixteen to seventeen tons; the plant complete with all ropes, blocks, curve rollers, etc., would represent an expendi- ture of five thousand to seven thousand, dollars. The running expenses will vary primarily with the suitability of the road, or slide provided, and with the size and quantity of the logs ; naturally cheapest logs are secured when a plant is operated to its full ca- pacity. It is useless to attempt without careful survey of specific con- ditions, even an approximation of cost of hauling, but where conditions course) a shorter line. A number of snatch blocks suitably slung on trees will in such event keep it in position and prevent entanglement on ground obstructions. The pulling line and load are kept in the proper route by suitable skids, shear logs, curve rollers or road spools. The load is composed of logs dogged in tandem; especially large, straight, and smooth logs usually being chosen for front and rear. Whe- ther the front or rear log, or both, be attached to the pulling line will Continued on Page 28.

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