The polymeter, or quintant |
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Page 2
... half - inches and numbered from 1 to 12 ; the inch being graduated into 20ths of an inch , and the Half Inch therefore into 10 ths . The nature of the graduations which are peculiar to the Polymeter Sector , and which occupy the space ...
... half - inches and numbered from 1 to 12 ; the inch being graduated into 20ths of an inch , and the Half Inch therefore into 10 ths . The nature of the graduations which are peculiar to the Polymeter Sector , and which occupy the space ...
Page 7
... half or 2640 yards . If the distance to be marked off be greater than this , the opening of the legs to a straight ... half - arrow shew 20 for example , then 20 ° will be the required angle . Should , however , the half - arrow not ...
... half or 2640 yards . If the distance to be marked off be greater than this , the opening of the legs to a straight ... half - arrow shew 20 for example , then 20 ° will be the required angle . Should , however , the half - arrow not ...
Page 8
... half - arrow at the end of the sector's leg . Thus , if the half - arrow stand between 190 and 20o on the annular disc , and should the graduation 30 on the outer set of graduations cut in with some one of those on the inner set of ...
... half - arrow at the end of the sector's leg . Thus , if the half - arrow stand between 190 and 20o on the annular disc , and should the graduation 30 on the outer set of graduations cut in with some one of those on the inner set of ...
Page 10
... half - arrow will be 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 ...
... half - arrow will be 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 ...
Page 11
... half angle by 2 , and then we shall have the angle sought . Hence , if by the graduation on the inner quadrant on the disc at the point marked west , we find the legs of the sector are expanded to an angle of 25o , we know then that the ...
... half angle by 2 , and then we shall have the angle sought . Hence , if by the graduation on the inner quadrant on the disc at the point marked west , we find the legs of the sector are expanded to an angle of 25o , we know then that the ...
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Common terms and phrases
according Annex Application base bearing Book called Cambridge circle Compasses constructed containing convenient Crown 8vo curve diameter dimensions disc distance divided divisions double drawn edge elevation English equal equation Examination example face fall figure four French Geometry give given side graduation Greek half hand head horizon hypotenuse illustration inches inclination indicated inner instrument joint length Line of Lines magnetic marked means measure ment Metallic Mile minutes Mirror namely North Notes object observed obtained opened operation opposite ordinary parallel perpendicular plane Polymeter position practical Problems proportion quadrant Quintant realized reflection represent right angle round rule ruler Scale Second Edition Sector seen Sermons Sextant shadow shew sight-vane slided slope Square stands taken Tangential third Treatise triangle Trigonometry true turned University of Cambridge Vernier whole yards
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