A Treatise On Surveying
A Treatise On Surveying
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Example, — To construct a vertical dial for a place in latitude 31** 30', Here, the angular distances of the hour lines from noon will be : — For I p.m. or II a.m. — tan / = cos 31° 30' + tan 15'' 12° 52' = tan 12° 52' (nearly) For 2 p.m. or ID a.m. — tan / = cos 31° 30' + tan 30** 26° 12' = tan 26° 12' For 3 p.m. or 9 a.m. — tan / = cos 31° 30' + tan 45** 40° 27' = tan 40° 27' and so on.
The angle formed by the gnomon with the vertical face of the dial will, of course, be 58° 30' = co-latitude....
In a horizontal and vertical dial, the dtvation of the style is respectively equal to the latitude and co-latitude of the place, for in fig. 72, showing a horizontal dial, P C N is the latitude, and in fig. 73, showing a vertical dial, P C N is the co-latitude.
The inclination of the plane of an oblique dial to the horizon (or plane of a horizontal dial), is called its incUnatiorty and its inclination to the prime vertical its declination.
In this manner a dial constructed for one place may be used at another.
What to read after A Treatise On Surveying?
You can find similar books in the "Read Also" column, or choose other free books by Middleton, Reginald Empson, 1844-1925 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Example, — To construct a vertical dial for a place in latitude 31** 30', Here, the angular distances of the hour lines from noon will be : — For I p.m. or II a.m. — tan / = cos 31° 30' + tan 15'' 12° 52' = tan 12° 52' (nearly) For 2 p.m. or ID a.m. — tan / = cos 31° 30' + tan 30** 26° 12' = tan 26° 12' For 3 p.m. or 9 a.m. — tan / = cos 31° 30' + tan 45** 40° 27' = tan 40° 27' and so on.
The angle formed by the gnomon with the vertical face of the dial will, of course, be 58° 30' = co-latitude....
In a horizontal and vertical dial, the dtvation of the style is respectively equal to the latitude and co-latitude of the place, for in fig. 72, showing a horizontal dial, P C N is the latitude, and in fig. 73, showing a vertical dial, P C N is the co-latitude.
The inclination of the plane of an oblique dial to the horizon (or plane of a horizontal dial), is called its incUnatiorty and its inclination to the prime vertical its declination.
In this manner a dial constructed for one place may be used at another.
What to read after A Treatise On Surveying?
You can find similar books in the "Read Also" column, or choose other free books by Middleton, Reginald Empson, 1844-1925 to read onlineMoreLess
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