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A two-pinned lewis consists of two pins, linked by a short chain. The pins are inserted into opposing holes that are drilled into the top of the stone at about 15° from vertical. It operates by gripping the stone (like two fingers lifting a tenpin bowling ball) as the weight of the stone is taken up by a crane or winch.
A drum can have as few as six casings and as many as twelve. Tension rods, also known as tuning screws, are threaded bolts that are placed around the rim of a drum and screw into the casings. They enable the musician to adjust the tension of the drum's head and affect its overall pitch, tone, and timbre.
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.
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 ...
In 1913, Woolley and Meredith defined them like Anthony, but gave the following dimensions: hex head cap screws up to and including 7 ⁄ 16 inch (11.1125 mm) have a head that is 3 ⁄ 16 inch (4.7625 mm) larger than the shank diameter; screws greater than 1 ⁄ 2 inch (12.7 mm) in diameter have a head that is 1 ⁄ 4 inch (6.35 mm) larger than ...
With the screw at the lower limit of its travel, the lever can come close enough to the instrument's top to pose a risk of scarring it. [9] To avoid damage to the top, the screw may be turned out as far as it goes while still engaging the lever, and the string re-tuned using the peg.
Lunt's Embassy Scroll pattern was chosen by the United States government as its official tableware in all U.S. embassies and consulates around the world. In late 2009, the company sold its name and inventory to competitor Reed & Barton .
Victorian architecture is a series of architectural revival styles in the mid-to-late 19th century. Victorian refers to the reign of Queen Victoria (1837–1901), called the Victorian era, during which period the styles known as Victorian were used in construction. However, many elements of what is typically termed "Victorian" architecture did ...