Titlebook: Handbook of Relay Switching Technique; J. Th. Appels,B. H. Geels Book 1966 Springer Science+Business Media New York 1966 applied physics.p

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Switching Algebra,For economical and practical reasons it is desirable when designing circuits to find the simplest possible form for a given circuit.

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Codes,The properties of the switching devices used in a circuit play a large part in the design of this circuit. One of these properties is the binary nature of by far the most elements of which a circuit can be built up.

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Checking Circuits,These circuits are used to check whether a given number . out of . relays are switched on. The simplest example of such a circuit is clearly a make contact unit, which can be used to check whether a given relay is energized or not.

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Some Computing Circuits with Relays,As has already been mentioned in Section 4.8, the digits of decimal numbers can be separately represented in binary form. The highest binary value occurring in this presentation is 1 0 0 1 (9). The values 1 0 1 0 to 1 1 1 1 are thus not used.

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Connecting Circuits,The purpose of a connecting circuit is to connect one device of a certain sort with another device of a different sort. A selector, together with the relays which operate it, is in fact a connecting circuit. In this case a locking circuit is used to stop the selector at the right time, as described e. g. in Fig. 155 of Chapter 9.

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Identification and Analysis Circuits,Identification circuits are used to determine the name or number of a line or a device.

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