Block gauge, as the name implies, is a certain shape, but the size of different gauges. In 1890, Mr. AL Stronghold (H. Ellstrom), head of the Swedish Arsenal mechanic, first created steel blocks of parallel between the two sides. Because of the small number of these blocks at that time, only a small part of the size of the measurement, and can not meet the needs of a variety of workpiece size measurement. 1898 work with Ayers Strong in the same department Mr. Hanson (Johansson), having felt the importance of block size, produced a series of block gauges of different sizes (102 metric blocks) to meet the needs of different measurement sizes. Only this kind of hand-made block rules, in addition to the superb technology, high cost, so not widely used at that time. Until later, the United States Bureau of Standards (N.B.S) has a tiger (William E. Hoke) Mr., the manual manufacture of blocks in the form of mechanical processing of the production, block gauge before the mass production, and widely respected by industry and application. Block gauge for the factory endpoint standard gauges, in the combination of different sizes, commonly used light push sliding stack and other ways, also known as sliding gauge (Slip gauge). Block gauge application measurement has been nearly hundred years, its production materials from steel, tungsten carbide development to ceramics, and also have a variety of different block number combination of the public English block gauge, shape also from rectangular to perforated square. In addition, the block gauge can evolve into some new measuring instruments such as precision height gauge, step (level) regulation, etc.
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