The polymeter, or quintant |
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Page viii
... reflection of the disc in it . If this seem to carry on the outline of the disc itself without a break , so that the image on the mirror completes the circle of the hinge , the mirror will be perpendi- cular . This , of course , assumes ...
... reflection of the disc in it . If this seem to carry on the outline of the disc itself without a break , so that the image on the mirror completes the circle of the hinge , the mirror will be perpendi- cular . This , of course , assumes ...
Page 8
... REFLECTING SECTOR OR QUINTANT . It will be perceived , that , from the joint of the sector , the middle of it has ... reflection , as in the instrument called the Sextant . The mirror , which stands at right angles to the plane of the ...
... REFLECTING SECTOR OR QUINTANT . It will be perceived , that , from the joint of the sector , the middle of it has ... reflection , as in the instrument called the Sextant . The mirror , which stands at right angles to the plane of the ...
Page 9
... Reflecting Semicircle of Sir Howard Douglas , the greatest angle that can be taken is 120 ° ; in this instrument ... Reflection . When the Polymeter is to be used as an angle - finder , the Mirror must be turned upwards on its Side ...
... Reflecting Semicircle of Sir Howard Douglas , the greatest angle that can be taken is 120 ° ; in this instrument ... Reflection . When the Polymeter is to be used as an angle - finder , the Mirror must be turned upwards on its Side ...
Page 10
... reflected lie to the left hand , or closing it , if it lie to the right hand , until he finds the object sought ... reflection be read off . A half - arrow will be seen at the inner end of the sector's leg . The graduation upon the ...
... reflected lie to the left hand , or closing it , if it lie to the right hand , until he finds the object sought ... reflection be read off . A half - arrow will be seen at the inner end of the sector's leg . The graduation upon the ...
Page 11
... reflection , and vice versa . " The definition of which angles is thus given in all treatises on optics : " The Angle of Incidence is the angle which is formed by the incident ray , with a perpendicular to the reflecting surface at the ...
... reflection , and vice versa . " The definition of which angles is thus given in all treatises on optics : " The Angle of Incidence is the angle which is formed by the incident ray , with a perpendicular to the reflecting surface at the ...
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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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