Improvements in Electrical Measuring Instruments.
Номер патента: GB189921810A
Опубликовано: 15-09-1900
Автор(ы): Frank Conrad, Harry Phillips Davis
Принадлежит: Individual
Опубликовано: 15-09-1900
Автор(ы): Frank Conrad, Harry Phillips Davis
Принадлежит: Individual
Реферат: 21,810. Davis, H. P., and Conrad, F. April 1, [date applied for under Sec. 103 of Patents &c. Act, A.D. 1883]. Current meters, for use as ampere- or volt-meters. Two U-shaped permanent magnets 3, fixed parallel, with like poles together, carry two hook-shaped pole-pieces 4, the curved parts of which are parallel and at a small distance apart. A single magnet may be used. A curved magnetic plate 32 is adjustably fixed below the pole-pieces. The magnets carry a horizontal rectangular frame 10 containing two jewelled pins 11, 12, which support the pivots of a light movable frame, shown in Fig. 2. This consists mainly of a bobbin 13, preferably stamped from one piece of sheet aluminium, to enclose one of the pole-pieces 4, along which it is movable. A flat plate 131 balances the movable frame, and passes between the pole-pieces, to damp the movements magnetically. The ends of the coil wound on the bobbin 13 are connected to the outer ends of two flat spiral springs 17, 22, carried by the pins 11, 12 ; the outer ends of the springs are attached mechanically to arms of the movable frame, but insulated therefrom. A pointer 16 attached to the movable frame indicates on a curved scale carried by the magnets.
Photographic apparatus with built-in electrical moving-coil measuring instrument
Номер патента: US3672270A. Автор: Karl Wagner,Josef Ganser. Владелец: Agfa Gevaert AG. Дата публикации: 1972-06-27.