Hints to Travellers, Scientific And General
Hints to Travellers, Scientific And General
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Digitized by VjOOQ IC PHOTOGRAPmO SUltVEYiNG. 175' Before making use of the photographs in the construction of the map' it is well to have them enlarged three or four times. Next determine the equivalent focal distance for each picture, which can be done by multiplying the length of any suitable distance measured in inches along the tangent scale from the central vertical line shown on the photograph, by the co-tangent of the angle corresponding on that scale to that length.
Now mark on the pho...tographs the points that are desired to be fixed, giving each point on all the photographs on which it occurs the same number, and take a strip of paper and mark these points off upon a horizontal line according to their distances from the central vertical line.
Having plotted the fixed points in their correct relative positions on the paper upon which the map is to be drawn, proceed to lay down in their proper position and orientation the horizontal lines with the points marked on them, as follows : Set off from the station marks the correct directions of the distance lines of the views, or the direction of the intersection point of the vertical and horizontal lines, with a protractor, prolonging these lines from the stations imtil they are equal in length to tiie equivalent focus of each picture.
What to read after Hints to Travellers, Scientific And General?
You can find similar books in the "Read Also" column, or choose other free books by Royal Geographical Society (Great Britain) to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Digitized by VjOOQ IC PHOTOGRAPmO SUltVEYiNG. 175' Before making use of the photographs in the construction of the map' it is well to have them enlarged three or four times. Next determine the equivalent focal distance for each picture, which can be done by multiplying the length of any suitable distance measured in inches along the tangent scale from the central vertical line shown on the photograph, by the co-tangent of the angle corresponding on that scale to that length.
Now mark on the pho...tographs the points that are desired to be fixed, giving each point on all the photographs on which it occurs the same number, and take a strip of paper and mark these points off upon a horizontal line according to their distances from the central vertical line.
Having plotted the fixed points in their correct relative positions on the paper upon which the map is to be drawn, proceed to lay down in their proper position and orientation the horizontal lines with the points marked on them, as follows : Set off from the station marks the correct directions of the distance lines of the views, or the direction of the intersection point of the vertical and horizontal lines, with a protractor, prolonging these lines from the stations imtil they are equal in length to tiie equivalent focus of each picture.
What to read after Hints to Travellers, Scientific And General?
You can find similar books in the "Read Also" column, or choose other free books by Royal Geographical Society (Great Britain) to read onlineMoreLess
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