. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. September, 1S97 THE CJLIZJLJDJL IvUMBERMAN. be over-run and the carriage moved at will, at any speed, in either direction, by simply moving a little lever which controls the current supplied to the motor. A log can be " fired " at the saw with this rig as spitefully as with the "gun barrel " steam feed so much prized by some saw- yers, and the speed can be regulated in a much more positive manner without having any steam pipes to freeze up, bu
. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. September, 1S97 THE CJLIZJLJDJL IvUMBERMAN. be over-run and the carriage moved at will, at any speed, in either direction, by simply moving a little lever which controls the current supplied to the motor. A log can be " fired " at the saw with this rig as spitefully as with the "gun barrel " steam feed so much prized by some saw- yers, and the speed can be regulated in a much more positive manner without having any steam pipes to freeze up, burst, or get broken through accident.—James F. Hobart, M. E., in The Wood-Worker. ELECTRICITY IN WOOD-WORKING CONCERNS. In the average wood-working shop run by an engine of 100 horse power, how many horse power do you suppose is consumed in driving shafting and belts, and is lost between the engine and the machines ? There is a good deal of loss, and in shops where the shafting runs pretty freely, it is safe to say that over 60 per cent, of the power developed by the engine is lost as above stated. It has been determined by pretty good authority that every time a certain amount of power is transmitted through a shaft, at least 10 per cent, of the power is absorbed by that single shaft. This seems like a good deal of loss, but it is for good shafting, well hung and easy running. What then must the loss be when the shafting is out ot line? Electric dynamos and motors have been brought to such a height ot perfection that the generator (as the dynamo is called) loses only five or six per cent, of the power delivered to it, in changing that form of power into electrical energy. The motor is equally efficient, and al- lowing for a loss of one per cent, in the conduct- ing wires, there is a total loss of 9 to 12 per cent, between engine and machine, instead of the 50 or 60 per cent, loss where shafting is used. That it is better and cheaper to carry power from the engine by wire than
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