Earth Driven Clock Co

of Leicester

1910 Founded by Percival Arthur Bentley, manufacturing the earth-driven clocks and scientific instruments invented by him in 1911.

1912-14 During the manufacture of earth-driven clocks, the pedograde machine, which had been patented by Mr. Harry Church, was redesigned and perfected. See Pedograde Co. The manufacture of this instrument called for modern methods of production and scientific construction, among which was the provision of a Vernier scale reading. The importance of three-point contacts was also realized. The machine was employed for accurate measurements of feet to provide data to determine the measurements of footwear. At that time Mr. Bentley also designed a magneto with magnets so arranged that a much greater spark was produced than hitherto.

WWI The firm was engaged in research for the production of accurate screw gauges; it then concentrated on the production of both male and female screw gauges, which were used in all branches of munitions production for the Army, Navy, and Air Force; the company was employed on this work up to the last year of the War. Consultations were held at the National Physical Laboratory, Teddington, to enable corrections to be carried out to a high degree of accuracy.

In connexion with this work, which confirmed the great accuracy of the gauge system, it was found necessary to introduce a new system for checking not only dimensions, but also shapes and forms of all types of threads. This method was the means of introducing the projection system of shadow values, which again entailed the solution of many problems and much perseverance, before it was perfected.

1916 The name of the firm was changed to that of Bentley Engineering Co to manufacture "earth-driven clocks" and scientific instruments invented by Mr. Bentley. Larger and more up-to-date premises were obtained.

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