The polymeter, or quintant |
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Page 7
... outer edge of the Sector , on the side with the Spirit - Level , there is sometimes a scale of 3 inches to a mile in yards ; the numbers are made to read both ways . When the instrument is opened at an angle of 90 ° it will evidently ...
... outer edge of the Sector , on the side with the Spirit - Level , there is sometimes a scale of 3 inches to a mile in yards ; the numbers are made to read both ways . When the instrument is opened at an angle of 90 ° it will evidently ...
Page 8
... outer set of graduations cut in with some one of those on the inner set of graduations , then the reading off would be 19o . 30 ' . If the coincidence should happen under the 38th of the outer graduations , then will the reading - off ...
... outer set of graduations cut in with some one of those on the inner set of graduations , then the reading off would be 19o . 30 ' . If the coincidence should happen under the 38th of the outer graduations , then will the reading - off ...
Page 9
... outer upper edge of it with the left thumb . When it can go no further , the lid of the box ( which has a cut in it , and is hinged at the end farthest from the sector's joint , ) must be raised to perpendicularity . This is the Sight ...
... outer upper edge of it with the left thumb . When it can go no further , the lid of the box ( which has a cut in it , and is hinged at the end farthest from the sector's joint , ) must be raised to perpendicularity . This is the Sight ...
Page 26
... outer end of the Sector's leg . The afternoon or western azimuth will be taken by the read- ing of the corresponding numeration on the 3a quadrant of the disc . X. MID - DAY DIAL . To find true solar noon . The instrument is to be laid ...
... outer end of the Sector's leg . The afternoon or western azimuth will be taken by the read- ing of the corresponding numeration on the 3a quadrant of the disc . X. MID - DAY DIAL . To find true solar noon . The instrument is to be laid ...
Page 29
... the instrument is so adjusted that the shadow of the scratch on the Mirror falls through the slit in the sight - vane , while the level shews horizontality , the reading at the outer edge will give the half MID - DAY DIAL . 29.
... the instrument is so adjusted that the shadow of the scratch on the Mirror falls through the slit in the sight - vane , while the level shews horizontality , the reading at the outer edge will give the half MID - DAY DIAL . 29.
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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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