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Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
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Screwdriver with rubber handle. The tool used to drive a slotted screw head is called a standard, common blade, flat-blade, slot-head, straight, flat, flat-tip, [6] or "flat-head" [7] screwdriver. This last usage can be confusing, because the term flat-head also describes a screw with a flat top, designed to install in a countersunk hole ...
Ceramic cleats, which were block-shaped pieces, served a purpose similar to that of the knobs except that cleats were generally used in places where the wiring was surface mounted. Not all knob and tube installations utilized cleats. Ceramic bushings protected each wire entering a metal device box, when such an enclosure was used.
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Insert Knob A in Hole B" is a science fiction short story by Isaac Asimov. The story was first published in the December 1957 issue of The Magazine of Fantasy and Science Fiction and reprinted in the 1969 collection Nightfall and Other Stories .
A lathe of 1871, equipped with leadscrew and change gears for single-point screw-cutting A Brown & Sharpe single-spindle screw machine. Fasteners had become widespread involving concepts such as dowels and pins, wedging, mortises and tenons, dovetails, nailing (with or without clenching the nail ends), forge welding, and many kinds of binding with cord made of leather or fiber, using many ...
A "knob" is a rounded hill, or mountain, usually found in older mountain ranges. McAfee Knob is named after James McAfee (Mac-a-fee), a Scottish-Irish immigrant who settled in the Catawba Valley in the late 1730s. [1] McAfee Knob is the tallest mountain in the area surrounding Catawba, at an elevation of nearly 3,200 feet (980 m). [2]