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The device is basically a Galilean seconds pendulum disguised as a classical column. It consists of a six-foot-tall vertical "ruler" marked off in inches, with a little peg-hole at every inch. From the right-angle bar that protrudes at the capital of the Ionic capital, hangs a string with a plumb bob at the end.
Dividing engine at the Museo Galileo in Florence.. There has always been a need for accurate measuring instruments. Whether it is a linear device such as a ruler or vernier or a circular device such as a protractor, astrolabe, sextant, theodolite, or setting circles for astronomical telescopes, the desire for ever greater precision has always existed.
Each ruler's scale has graduations labeled with precomputed outputs of various mathematical functions, acting as a lookup table that maps from position on the ruler as each function's input. Calculations that can be reduced to simple addition or subtraction using those precomputed functions can be solved by aligning the two rulers and reading ...
Bygrave A.M.L. Position line slide rule Mk. IIA serial No. 355. The Bygrave slide rule is a slide rule named for its inventor, Captain Leonard Charles Bygrave of the RAF.It was used in celestial navigation, primarily in aviation.
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]
TimeAxis = orientation:vertical The attribute value as "vertical" displays the bars as upright. AlignBars = justify Using command AlignBars=justify will auto-widen the bars to fit. ScaleMajor = gridcolor:darkgrey increment:1000 start:0 Command "ScaleMajor" sets the major y-axis ruler lines across the graph.
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] Other types of T-square are used by woodworkers and glaziers for marking up sheet materials such as plywood, glass, and plasterboard.
A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction as a reference line, or plumb-line. It is a precursor to the spirit level and used to establish a vertical datum. It is typically made of stone, wood, or lead, but can also be made of other ...