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Hans August Johannesen
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Individual
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Publication of GB190606659ApublicationCriticalpatent/GB190606659A/en
Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated
(AREA)
Abstract
6659. Johannesen, H. A. March 20. Compasses, magnetic.-The heeling error is corrected by a vertically adjustable magnet a arranged centrally above the compass b. The magnet is secured by a screw c to a socket d secured to the binnacle glass e by a nut f.
GB190606659D1906-03-201906-03-20An Improvement in connection with the Mariner's Compass.
ExpiredGB190606659A
(en)
Improvements in Fittings for Obtaining Rapid Adjustments of Levels Theodolites, or other Instruments such as require to be Mounted on Tripods or Stands.
A Device for Communicating Very Small Amounts of Rotary Motion to the Levelling or other Screws of Surveying, Geodetic, Astronomical and other Instruments of Precision.