"This map and chart is neither a plain, Mercator's, nor globular projection; the author finding that, on a globular map, the superficies is contracted, on Mercator's it is (in high latitudes) protracted much beyond its true measure, and on the plain chart distorted quite out of its true form; to avoid these false appearances as much as possible he has aimed at a mean of the three. And on examining and comparing this with the latest surveys, & best information that can be produced, I find it as correct & true a representation of the coast, rivers, lakes, and mountains &c. As can be expected on so small a scale. Osgood Carleton teacher of mathematicks."
IIIF Manifest