Scientific American Supplement, No. 286, June 25, 1881Various
Science
Scientific American Supplement, No. 286, June 25, 1881
Various
Science -- Periodicals
As will be seen from this description, the woof does not undergo the
least strain, and may be drawn very gently from the shuttle. Neither
does this latter exert any friction on the chain, since it does not move
on it as in ordinary looms. In this apparatus, therefore, there may be
employed for the chain very delicate threads, which, in other looms,
would be injured by the shuttle passing over them. Looms constructed on
this plan have for some time been in very successful use in Switzerland.
* * * * *
HOW VENEERING IS MADE.
The process of manufacture is very interesting. The logs are delivered
in the mill yard in any suitable lengths as for ordinary lumber. A steam
drag saw cuts them into such lengths as may be required by the order
in hand; those being cut at the time of our visit were four feet long.
After cutting, the logs are placed in a large steam box, 15 feet wide,
22 feet long, and six feet high, built separate from the main building.
This box is divided into two compartments. When one is filled entirely
full, the doors are closed, and the steam, supplied by the engine in the
main building, is turned on. The logs remain in this box from three to
four hours, when they are ready for use. This steaming not only removes
the bark, but moistens and softens the entire log. From the steam box
the log goes to the veneer lathe. It is here raised, grasped at each end
by the lathe centers, and firmly held in position, beginning to slowly
revolve. Every turn brings it in contact with the knife, which is gauged
to a required thickness. As the log revolves the inequalities of its
surface of course first come in contact with the keen-edged knife, and
disappear in the shape of waste veneer, which is passed to the engine
room to be used as fuel. Soon, however, the unevenness of the log
disappears, and the now perfect veneer comes from beneath the knife in
a continuous sheet, and is received and passed on to the cutting table.
This continues until the log is reduced to about a seven inch core,
which is useless for the purpose. The veneer as it comes rolling off the
log presents all the diversity of colors and the beautiful grain and
rich marking that have perhaps for centuries been growing to perfection
in the silent depths of our great forests.
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