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Friedrich Gebhardt
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Publication of GB189818106ApublicationCriticalpatent/GB189818106A/en
18,106. Gebhardt, F. Aug. 23. Levels; plumb-rules; clinometers.-In an aperture in a rule a, covered at the back by a disc k, is fitted an in-turned ring b and flanged disc c on which a dial is marked four times over 0-90‹. A central spindle f carries a pointer h and pendulum arm g over which is placed a watch-glass.
GB189818106D1898-08-231898-08-23An Improved Rule adapted for Measuring and for Indicating Vertical, Horizontal and Inclined Directions.
ExpiredGB189818106A
(en)
Improvements in Instruments for Determining the Compass Course of a Ship from the True Course, or for Determining the True Course from the Compass Course.