Polyconic projection is that in use in the United States coast and geodetic survey.
Chart Projections The earth is projected, so to speak, upon a chart in three different ways--the Mercator Projection, the Polyconic Projection and the Gnomonic Projection.
The Polyconic Projection is especially adapted to surveying, but is also employed to some extent in charts of the U.
Illustration] A straight line on the polyconic chart represents a near approach to a great circle, making a slightly different angle with each meridian of longitude as they converge toward the poles.
On polyconic and other larger scale charts distances are measured from the scales printed on the chart.
The polyconic projection is not used for very extensive areas of the earth's surface, as for instance a hemisphere.
These conditions are substantially fulfilled by several projections, of which the polyconic is used in the United States.
Footnote 7: Methods and results: Tables for the projection of maps and polyconic development; Appendix No.
Figure 5, however, illustrates the mechanical or constructional features of the polyconic projection and if used in connection with the published tables will probably be a sufficient guide for projecting a map on any desired scale.
The polyconic projection has been adopted by the Geological Survey for its topographic atlas sheets and must be consistently used for its other maps.
But to save labour it is customary to employ for this purpose either form of polyconic projection, in which the errors for such scales are also negligible.
The simple polyconic is used by the topographical section of the general staff, by the United States coast and geodetic survey and by the topographical division of the U.
A rectilinear approximation to the simple polyconic is also used for the topographical sheets of the Survey of India.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "polyconic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
