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Cochrane and McCrone argue that the thumbscrew entered Britain later than the invasion of the Spanish Armada in the 16th century: "It has been very generally asserted," says Dr. Jamieson, "that part of the cargo of the invincible Armada was a large assortment of thumbikens, which it was meant should be employed as powerful arguments for convincing the heretics."
Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...
The Phillips/square screw drive, also known as the Quadrex, Pozisquare screw drive, is a combination of the Phillips and Robertson screw drives. While a standard Phillips or Robertson tool can be used, there is also a dedicated tool for it that increases the surface area between the tool and the fastener so it can handle more torque.
Thumbscrew (fastener), a type of screw with a tall head and ridged or knurled sides, or a flat vertical head, ... Mobile view; Search. Search. Toggle the table of ...
Illustration from the 1909 Canadian patent for the Robertson screw. Peter Lymburner Robertson (December 10, 1879 – September 28, 1951) was a Canadian inventor, industrialist, salesman, and philanthropist who popularized the square-socket drive for screws, often called the Robertson drive.
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The grip used for a screwball. The baseball is held with the open end of the horseshoe shape (where the seams are closest together) facing upward. The thumb is placed just beneath the bottom of the horseshoe, the index finger is curled against the top of the thumb, forming a tight circle to the side of the ball.
Phillips screw head. Henry Frank Phillips (June 4, 1889 – April 13, 1958) was an American businessman from Portland, Oregon. The Phillips-head ("crosshead") screw and screwdriver are named after him. [1] The importance of the crosshead screw design lies in its self-centering property, useful on automated production lines that use powered ...
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