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In 1878 Laroy S. Starrett invented and patented the first combination square, [4] and in 1880 he founded the L.S. Starrett Company in Athol, Massachusetts, in order to produce it and other precision tools. In 1882, Starrett traveled to London and Paris to appoint sales representatives, thereby starting up the international marketing of his ...
Though some earlier 19th century tools were called combination squares, the modern combination square was invented in the late 1870s by American inventor Laroy S. Starrett, and patented in 1879. [note 1] [8] In 1880 he founded the L. S. Starrett Company in Athol, Massachusetts, United States. The tool was originally designed for machinists, but ...
T bevel with protractor and dividers In use. A sliding T bevel, also known as a bevel gauge or false square [1] is an adjustable gauge for setting and transferring angles. . Different from the square, which is fixed and can only set a 90° angle, the sliding T bevel can set any angle and transfer it on anoth
Apples. The original source of sweetness for many of the early settlers in the United States, the sugar from an apple comes with a healthy dose of fiber.
PF-98 reusable tube launcher is a fibreglass-wrapped smoothbore gun and weighs under 10 kg (22 lb). Two variants, battalion-level and company-level, are available. Both variants share the same launch tube and rocket projectiles. Their difference in capabilities and usage lies in their sighting system and tripod mount.
In January 1908, the Karabiner Model 1898 AZ (Kar 98AZ) was accepted for service. The new features were a small diameter (33 mm (1.30 in)) receiver ring, tapered rather than stepped barrel contour, an L-shaped stacking rod attached to the stock near the muzzle, and a turned-down bolt handle and recess in the stock in the same fashion as the ...
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
A tubular spirit level A bull's eye spirit level mounted in a camera tripod. A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical . Two basic designs exist: tubular (or linear) and bull's eye (or circular).