. Canadian forest industries 1894-1896. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. Dunbar's Clapboard Machine. centers in a frame which can be conveniently moved to or from the saw when in motion, and is perfectly under con- trol of the operator. The block is revolved and held securely in place when being sawn by a spur roll placed on its top end, and which is automatically turned by each which gives it a uniform speed when in cut, and avoids all jar at the ends of the stroke. The sapping head is of new design, being made of brass, with five st
. Canadian forest industries 1894-1896. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. Dunbar's Clapboard Machine. centers in a frame which can be conveniently moved to or from the saw when in motion, and is perfectly under con- trol of the operator. The block is revolved and held securely in place when being sawn by a spur roll placed on its top end, and which is automatically turned by each which gives it a uniform speed when in cut, and avoids all jar at the ends of the stroke. The sapping head is of new design, being made of brass, with five steel knives which will make a cut four inches deep without jar of block or arbour. These knives are placed so as to be made to cut on the outer edge of block, allowing of the greatest daimeter being left for boards. Amongst the principal advantages claimed for tins machine are that it will cut into clapboards lumber that cannot be profitably manufactured in any other way, such as very large hollow-hearted pine of any style or shape, leaving only a centre of one-and-three-quarter inches diameter, and the bottom center can be raised so as to cut all short ends up to 24 inches long. It will be under- stood that the block being on end when being sawn, is very easily revolved and accurately set to give boards of exact thickness. This is one of the principal advant- ages, as it allows of very thin saws being used. This machine is guaranteed to take from 15 to 20 per cent, more out of the same lumber and from 30 to 40 per cent, in the same time than the old style of machine. It will take in lumber up to five feet in diameter and four feet three inches long. Its capacity is from five to seven thousand per day, depending greatly on the quality of lumber. This machine is not exactly new, as three of them were made four years ago, which have been in constant opera- tion since, but owing to the builders having had their foundry and patterns burned in 1892 they have been unable to manufactur
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
