Speed calculator

US3933050A · kind A · utility

Assignee

• The United States of America as represented by the United States National Aeronautics and Space Administration Office of General Counsel-Code GP · US

Inventors

• John L. Burch · Decatur, US
• James C. Billions · Huntsville, US

Key dates

• Filing date: Feb 27, 1974
• Grant date: Jan 20, 1976
• Expiry date: Feb 27, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/64
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An apparatus for measuring the velocity of a vehicle traveling between first and second measured points. The apparatus includes a cylindrical housing having an open top for receiving a transparent disk. Indicia representing speed calibrations is circumferentially spaced adjacent an outer perimeter of the disk. A stopwatch is carried in the housing below said disk and has a rotatable hand which rotates at a predetermined rate under the indicia. A lamp is carried below the stopwatch for illuminating the indicia carried on the transparent disk. The stopwatch is started when the vehicle passes a first reference point and stopped when the vehicle passes the second reference point. Thus, when the hand is stopped, such points to the calibrated indicia on said disk indicating the velocity of a vehicle.