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Percentage unit of angular measurement, with logarithms; also a description of his percentage theodolite and percentage compass, for the use of surveyors, navigating officers, civil and military engineers, universities and colleges PDF
1912
23.1 MB
EnglishPreview Percentage unit of angular measurement, with logarithms; also a description of his percentage theodolite and percentage compass, for the use of surveyors, navigating officers, civil and military engineers, universities and colleges
FERGUSSON'S TP~*\ YE~"^ TR""\ /C"""NE1 "* NX 1Tf~T^AA Gs .E1 i Ur TNT* I7 T AN G R MBASU REMENT IJ I .A WITH LOGAITHMS FOR ITS US AND FOR EGREES. MlNUTliS AND SECONDS JOHN I^RGUSSON C. M. JNST. C. E. FERGUSSON'S PERCENTAGE UNIT OF ANGULAR MEASUREMENT, WITH LOGARITHMS. THE MIDLAND COUNTIES HERALD LTD.. 16, UNION STREET, BIRMINGHAM. PLATE I. T T20 Mi <i Mi -6i0, 7=%^~8i 9tr t 'figure explains the construction of Fergusson's Percentage Circle by showing the tangent scales to the octants. Thiscircle isattachedto the Percentage Theodolite and to Magnetic Compass- dtals togetherwitha concentric circle dividedintodegrees. Each circle can be read &y two separate andopposite indices, either in percentage units or degrees. Thiscircle willconvert any angularinstrumentintoamostsimpleandaccurate range-finder.
