## Calculating instruments and machines |

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### Contents

Introduction | 1 |

The Differential Analyser and Partial Differential | 26 |

Some Other Instruments | 44 |

Copyright | |

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### Common terms and phrases

adder adding unit addition analytical engine approximation arithmetical operations automatic Babbage Babbage's binary boundary conditions calculating machine cards carried carry-over characteristics coded coefficients computing connections control system convenient counter decimal digits delay line differential analyser digital machine electrical electronic elements Eniac equation of heat equipment evaluated example finite differences form of storage formula function HALF ADDER half-adder Hartree Harvard Mark heat conduction input tables Inst instrument integrand integraph integration interconnections interpolation interval involved isograph iterative method iterative process Journ large number linear Mark I Calculator means mechanical minor cycle multiplication obtained operating instructions ordinary differential equations output partial differential equation Proc programming punched punched tapes quantities relays repetition representation of numbers represented rotation sequence of operations serial set of equations set-up shaft shown in fig signal simultaneous single specified successive tape temperature tion transfer trial solutions University of Cambridge values voltage