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US 4,228,516 AGranted
Computer for metric conversion
OwnerHarry L. Johnston, Sr.inventor
Life of this patent
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Abstract
A computer adapted for metric conversions from the English system of measurement to metric, and reciprocally back to English from metric, comprising a control panel with dual window to give a simultaneous visual reading of the input and output factors, with control units to switch the conversion control system to one of a series of metric conversion media; said computer having an electronic system with conversion means from English units to metric units, and conversely metric units to English units in each of several physical measurement classifications.
Claims1
A metric conversion computational system comprising:
- (a) a control unit with a face
- (b) a plurality of control switches to impress input data into the computer;
- said control switches being located in the face of the control unit;
- (c) switch means to switch electrical circuitry from arithmetic to metric conversion system;
- said switch means being located on the face of the control unit;
- (d) a control switch on said control unit for changing the metric conversion computational system from one type of conversion media to another;
- (e) analog electrical means connected to said control switch, said analog electrical means comprising a rotatable member having discrete resistance values for each conversion area.
4 more elements
Dependencies are inferred from the claim text.