The polymeter, or quintant |
From inside the book
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Page viii
... seen a screw running obliquely through one of the sheaves of the hinge ; by turning this , the mirror will receive a slight motion round its own centre , in order to correct any accidental deviation from the proper position with respect ...
... seen a screw running obliquely through one of the sheaves of the hinge ; by turning this , the mirror will receive a slight motion round its own centre , in order to correct any accidental deviation from the proper position with respect ...
Page 10
... seen at the inner end of the sector's leg . The graduation upon the quadrant , with which that half - arrow coincides , is , when multiplied by 2 , the required angle . Why this doubling of the angle read off is necessary is thus ...
... seen at the inner end of the sector's leg . The graduation upon the quadrant , with which that half - arrow coincides , is , when multiplied by 2 , the required angle . Why this doubling of the angle read off is necessary is thus ...
Page 11
... seen in the mirror at the vertex c of the triangle acb : If , thirdly , a line ct be drawn from that vertex c in the direction of that reflected object , viz . the tree at t : Then will the angle tca , which is contained between such ...
... seen in the mirror at the vertex c of the triangle acb : If , thirdly , a line ct be drawn from that vertex c in the direction of that reflected object , viz . the tree at t : Then will the angle tca , which is contained between such ...
Page 14
... seen on the Annex . The reading of the angle will be twice the number indicated by the half - arrow at the extre- mity of the Line of Sight against the number on the inner ring of the instrument , or double the reading + 100 . If the ...
... seen on the Annex . The reading of the angle will be twice the number indicated by the half - arrow at the extre- mity of the Line of Sight against the number on the inner ring of the instrument , or double the reading + 100 . If the ...
Page 15
... seen in the middle of this internal glass - barrel ; the difference between the middle of the bore of the tube and the bore at the ends of it , so slight as to be almost ideal , is sufficient on the least decli- nation of the cylinder ...
... seen in the middle of this internal glass - barrel ; the difference between the middle of the bore of the tube and the bore at the ends of it , so slight as to be almost ideal , is sufficient on the least decli- nation of the cylinder ...
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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
Popular passages
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