The polymeter, or quintant |
From inside the book
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Page xi
... shews the Equation of Time . Those who prefer the instrument in its former condition , without those graduations and notations necessary to shew the Time and to correct it , may have it , but as neither bulk nor weight are increased by ...
... shews the Equation of Time . Those who prefer the instrument in its former condition , without those graduations and notations necessary to shew the Time and to correct it , may have it , but as neither bulk nor weight are increased by ...
Page 5
... shews a graduation of 180 degrees , to which there is a double numeration , in order that the instrument may be used both ways ; by means also of the Vernier Scale it reads also to minutes of a degree : this also reads both ways , by ...
... shews a graduation of 180 degrees , to which there is a double numeration , in order that the instrument may be used both ways ; by means also of the Vernier Scale it reads also to minutes of a degree : this also reads both ways , by ...
Page 6
... shew the required angle . He then lays one leg of the sector along the line drawn on his plan ; and next adjusts the angle of the small quadrant over his point or position on the paper . When the instrument is so placed that the angle ...
... shew the required angle . He then lays one leg of the sector along the line drawn on his plan ; and next adjusts the angle of the small quadrant over his point or position on the paper . When the instrument is so placed that the angle ...
Page 7
... shew 20 for example , then 20 ° will be the required angle . Should , however , the half - arrow not exactly coincide with any graduation , but lie between some two graduations , then the observer must run his eye to the right THE ...
... shew 20 for example , then 20 ° will be the required angle . Should , however , the half - arrow not exactly coincide with any graduation , but lie between some two graduations , then the observer must run his eye to the right THE ...
Page 11
... shew , that whereas we have been speaking of and wishing to obtain the angle between the points b and t , we have only got the measure of the angle between a and b ; but as we know that the greater angle is double of the former , all ...
... shew , that whereas we have been speaking of and wishing to obtain the angle between the points b and t , we have only got the measure of the angle between a and b ; but as we know that the greater angle is double of the former , all ...
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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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