VENTILATING WOODEN COLUMNS.
ZANESVILLE, O., December 23,1889.
TO THE EDITORS OF THE AMERICAN ARCHITECT:
Dear Sirs,—We notice that in buildings in the East for factory purposes, all wood columns have a hole bored through the centre for ventilation. What size should the hole be for 12" x 12", 10" x 10" and 8" x 8" posts. Also size of cross holes for the purpose of communicating with vertical hole, and how far from ends.
Respectfully yours,
A.E. PILING CO., LTD.
[We have referred this to Mr. C.J.H. Woodbury who replies that the method followed by the best mill-builders is to bore a hole along the axis one and three-fourth to two inches in diameter. The method formerly used was to bore the hole in half-way from each end after the column was finished, but as the auger would follow the grain of the wood, the holes would not always meet, and running out nearer the side of the column would produce structural weakness which has been revealed in tests of columns whenever destructive tests of such columns have been made. The better way is to arrange a lathe with a hollow headstock and a guide which will carry a pod-auger boring in from one end. This will define the axis of the column whether it is to be turned or left square. Near each end, say five inches, a couple of transverse holes generally five-eighth of an inch in diameter are bored. This arrangement is to reduce and in some cases prevent checking in the same way as has been used, time immemorial, for getting out hubs for wagon wheels.—EDS. AMERICAN ARCHITECT.]