The polymeter, or quintant |
From inside the book
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Page 20
... substitute for that metallic liquid has been found in a metallic plate levelled by means of a Spirit - Level , and three adjusting screws . The present Instrument gives the Tangential Line in four ways : i . A Horizontal Line at right ...
... substitute for that metallic liquid has been found in a metallic plate levelled by means of a Spirit - Level , and three adjusting screws . The present Instrument gives the Tangential Line in four ways : i . A Horizontal Line at right ...
Page 32
... substitute for a pair of Compasses , and , in con- junction with the Sector , serves for Proportional Compasses , Ready Reckoner , Ruler , General Line - divider , Trigonometer , and likewise , when so needed , for a Plumb . It is also ...
... substitute for a pair of Compasses , and , in con- junction with the Sector , serves for Proportional Compasses , Ready Reckoner , Ruler , General Line - divider , Trigonometer , and likewise , when so needed , for a Plumb . It is also ...
Page 35
... substitute for this instrument , as found in the Poly- meter , lies in the use of certain graduations on those radial or edge lines of the Sector , to which belong the words Planes , " Solids , ' ' Pol . ' ( for Polygons , ) seen on one ...
... substitute for this instrument , as found in the Poly- meter , lies in the use of certain graduations on those radial or edge lines of the Sector , to which belong the words Planes , " Solids , ' ' Pol . ' ( for Polygons , ) seen on one ...
Page 41
... substitute for one , which , not knowing a better name for it , I shall call the Brigade Major or Adju- tant . This is composed of two concentric circles moving on a central pivot , having a logarithmic graduation . The object of this ...
... substitute for one , which , not knowing a better name for it , I shall call the Brigade Major or Adju- tant . This is composed of two concentric circles moving on a central pivot , having a logarithmic graduation . The object of this ...
Page 50
... substitute for it on the edge of the Square the value of b , the graduated disc of the joint will now shew the value of the angle contained by the side a with the side c . The third angle may be found in the same way ; but , as it is ...
... substitute for it on the edge of the Square the value of b , the graduated disc of the joint will now shew the value of the angle contained by the side a with the side c . The third angle may be found in the same way ; but , as it is ...
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Common terms and phrases
angle of elevation angle required Annex Artificial Horizon base centre circle Clinometer Compass-leg Conic Sections constructed Crown 8vo diameter Differential Calculus dimensions distance division draughtsman English Mile English Yards engraved equivalent number Friedrichs d'or German given angle given side given to find graduated disc half-arrow hinge-joint hypotenuse inches inner edges joint length Line of Lines lower leg magnetic bearing Marquois Scales measure ment Meridian metal Square metre Millimetres Mirror number of yards observed Open the instrument Open the Sector opposite leg outer edge parallel Parallel Ruler perpendicular plane Polymeter Proportional Compasses Protractor quadrant Quintant radius required angle required triangle right angle right-angled triangle ruler Russian Werst scale of equal secant lines Second Edition Sector's legs set of graduations Sextant shadow sight-vane Sine sion slided Spirit-Level stands tenuse third angle Third Edition third side Treatise Trigonometer University of Cambridge Vernier Scale
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