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| Drawing for patent 14,289, issued in February 1856 to John H. Palmer. |
In 1856 John H. Palmer patented and exhibited a blind slat tenoning machine. Its novelty was in using a pair of cutterheads to simultaneously cut the tenons on both ends of a slat.
Information Sources
- 1856-03-01 Scientific American.
Blind Slat Tenoning Machine.—By John H. Palmer, of Elmira, N. Y. Two small cutter heads are arranged upon the extreme ends of a pair of mandrels which have a horizontal lateral movement. The slats being introduced between the cutters, the latter are moved up and operate on the slats. Two round tenons are simultaneously produced, one at each end of the slat. This is a very rapid machine. The special novelty consists in cutting both tenons at once, the common machines being only capable of operating upon one end of the slat at a time.
- 1856 Annual Report of the Ohio State Board of Agriculture lists entries at the Seventh Annual Fair of Ohio, held at Cleveland in September 1856. J. H. Palmer of Elmira, N. Y., exhibited a blind tenoning machine.