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It was a development of an earlier technique of measuring road depressions manually with a ruler under a 10 feet (3.0 m) straight-edge. [ 4 ] [ 6 ] This method had later been developed by the British Department of Transport with the use of graduated wedges which were pushed under the ruler to measure the height, but remained a slow and ...
A hook gauge or needle gauge is a measuring device used by crocheters and knitters to test the sizes of particular crochet hooks and knitting needles. Hook gauges are usually made of plastic or aluminum and have sizing holes from 2mm to 11mm diameter. A hook gauge also functions as a ruler to test the size of a test swatch of handmade fabric. [1]
An ornate 18th century iron straightedge. A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler.
Artifact-free definitions fix measurements at an exact value related to a physical constant or other invariable phenomena in nature, in contrast to standard artifacts which are subject to deterioration or destruction. Instead, the measurement unit can only ever change through increased accuracy in determining the value of the constant it is ...
A combination square features a ruler (the blade) which can be slid and adjusted within a head (the stock). The head usually has one face at 90° to the ruler, and another face at 45° to the ruler. Originally designed for machinists, the tool is also commonly used in woodworking.
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Dial indicator, also known as a dial test indicator, dial gauge, or probe indicator an instrument used to accurately measure small linear distances. Feeler gauge: a simple tool used to measure gap widths. Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard.
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