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conceptualized as "rolling" a separate cone tangent to the Earth at each parallel of latitude, rather than a single cone as in a normal conic projection. Each parallel is a circular arc of true scale. The scale is also true on the central meridian of the projection. This projection was in common use
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by many map-making agencies of the United States from the time of its proposal by
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111:Knowledge (XXG) Picture of the day July 2016
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81:in 1825 until the mid-20th century.
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69:American Polyconic projection
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79:Ferdinand Rudolph Hassler
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