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Hauraki Plains Gazette, Volume XXXIII, Issue 4393, 22 March 1922, Page 2

A lock washer of new design was on display at the Science Institute at South Kensington. Th'is device is known as the P,alnut safety lock washer, and is super-imposed on top of the nut, not under iC It consists of a steel hexagon so flanged: as to seat at. six points of contact, practically a complete circle, in the base of the pitch of the ■thread. One of the flanges is raised so as to conform to the chamber of the thread—it is made for—all thre.ads in all dimensions—and, after t‘he nut has been set heme—the washer is spun down to contact with it. A half-turn with a spanner causes the flanges to spread out, and the partial inversion established presses them tightly home. Vibration merely intensifies tlhe pressure, which can be regulated at will. It cannot, become unstuck. and thus a positive lock is assured which is not deleterious to the thread, and instantly detachable when required. These washers are made by the Palnut Companyi, Ltd., of London. PUTTING HIM ON TO IT. Lushman: “I’m troubled with headaches in the morning. It may be on account of my eyes ; perhaps T need stronger glasses.” Dr. Shrude : "No. I think yon mere< 1y weaker glasses—and fewer—4 at night.”