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T-square, or glazier's square, [1] or drywall square. [26] A T-square is a style of square where the blade is fixed onto on into the middle of the stock, forming a 'T' shape. The most common type of T-square is a guide for drawing horizontal lines on a drawing board, and can guide a set square to draw vertical or diagonal lines. [27]
In dynastic China, the kè was a unit that represented 1 ⁄ 100 of a day (it has since been redefined to 1 ⁄ 96 of a day, or 15 minutes). In France, a decimal time system in place from 1793 to 1805 divided the day into 10 hours, each divided into 100 minutes, in turn each divided into 100 seconds; the French Republican Calendar further ...
These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with 30-60-90 degree angles. Combining the two forms by placing the hypotenuses together will also yield 15° and 75° angles. They are often purchased in packs with protractors and compasses. Less commonly found is the adjustable set square.
The United States adopted the conversion factor 1 metre = 39.37 inches by an act in 1866. [30] In 1893, Mendenhall ordered the physical realization of the inch to be based on the international prototype metres numbers 21 and 27, which had been received from the CGPM , together with the previously adopted conversion factor.
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
The caliper had an inscription stating that it was "made on the gui-you day, [a] the first day [b] of the first month of the first year of Shijianguo. [c]" The calipers included a "slot and pin" and "graduated in inches and tenths of an inch." [7] [8] The modern vernier caliper was invented by Pierre Vernier, as an improvement of the nonius of ...
One edge is divided into tenths of an inch, and the subsequent ones are directly marked for twentieths, thirtieths, fortieths, fiftieths, and finally sixtieths of an inch. Referred to as 1:10, 1:20, 1:30,1:40, 1:50 or 1:60 scale. [2] Typically in civil engineering applications, 1:10 (1″=10′) is used exclusively for detail drawings.
Many US tapes also have special markings every 16 inches (406 mm), which is a US standard interval for studs in construction: three spaces of 16 inches make exactly 4 feet (1,219 mm) which is the US commercial width of a sheet of plywood, gyproc or particle board. A dual scale inch/centimeter tape measure.