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Inventors The History of Measurement and Measuring Tools
Among the earliest length measures was the foot, which varied from place to place There were two common sizes for a "foot" - the foot of 246 to 252 mm based on a man's bare foot - the foot of 330 to 335 mm based on two hand measurements. The first calibrated foot ruler was invented in 1675 by an unknown inventor.

A History of Measurement and Metrics
From Noah's ark to modern times, the history of measurement and measuring tools.

A Brief History of Measurement Systems
Weights and measures were among the earliest tools invented by man. Primitive societies needed rudimentary measures for many tasks: constructing dwellings of an appropriate size and shape, fashioning clothing, or bartering food or raw materials.

A Dictionary of Measures, Units and Conversions
This provides a summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion.

Historical Facts about Measuring Devices
We know that for as long as history has been recorded there have been standards of length defined. Three different Greek standards are known. The Doric foot, the Attic foot and the Samian foot.

Measuring Devices
The makers and markers of gauges, rules, squares & tapes.

Specific Instruments
An instrument which measures vertical distance with respect to a reference level. Louis Paul Cailletet was the French physicist who invented the altimeter.

Carpenter Square - Drafting - Drafting Equipment

Clocks & Timekeeping
The invention of the quartz watch, mechanical clocks, timekeeping devices, time.

The Protractor
An instrument used to construct and measure plane angles. The simple protractor looks like a semicircular disk marked with degrees, from 0º to 180º. The simple protractor is an ancient device. The first complex protractor was created for plotting the position of a boat on  navigational charts. Called a three-arm protractor or station pointer, it was invented in 1801, by Joseph Huddart, a U.S. naval captain. The center arm is fixed, while the outer two are rotatable, capable of being set at any angle relative to the center one.

In 1731, Thomas Godfrey and John Hadley independently invented the reflecting quadrant, a precursor to the sextant. John Campbell invented the sextant in 1757. The octant could only measure latitude, and not longitude. Royal Naval Captain John Campbell's sextant could measure both longitude and latitude

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Related Information
The History of Mathematics
Office Innovations

©Mary Bellis

From Mary Bellis,
Your Guide to Inventors.
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