Mapping Boston in 1795

ARGO (American Revolutionary Geographies Online) offers a new article by John W. Mackey titled “Practical Knowledge and the New Republic.”

It begins:

Perhaps what is most visually striking about Osgood Carleton’s recently rediscovered 1795 map of Boston is its sheer size. At approximately seven feet by six and a half feet, this wall map dwarfs many other Boston maps of the late eighteenth century, including Carleton’s own 1797 work, which until recently was considered the largest Boston map from this period known to be extant in a collection.

This isn’t a printed map but a drawing. The Massachusetts Charitable Mechanic Association donated it to the Leventhal Map & Education Center at the Boston Public Library in 2021. Based on a cartouche dedicating the map “To the Select-Men of the Town of Boston,” curators deduced it was originally town, then city property.

Indeed, volume III of a report on Documents of the City of Boston, for the Year 1879 (published 1880) had an appendix listing “Plans of Boston in the City Surveyor’s Department,” and that included:

Boston, 1795.—An original map. Surveyed by Osgood Carleton for the Select-men.

As for the cartographer:

Osgood Carleton was born to a New England farming family in 1742 and had little schooling. At age 16, he began military service in Nova Scotia during the Seven Years’ War, and he later served in the Continental Army during the American Revolution. While he was born in New Hampshire and appears to have lived for a time in Haverhill, Massachusetts and in Maine, it was in Boston that Carleton made his mark and built the bulk of his career. Armed with mathematical skills presumably gained during his military service, Carleton earned his living putting these skills to practical use: he became a surveyor, a contributor to the ubiquitous almanacs of the era, and the leading cartographer in Massachusetts during his lifetime. . . .

he also left a legacy in his role as a teacher of young men in the City of Boston. . . . he offered on an array of practical mathematical skills from navigation to surveying and mensuration to gunnery, bookkeeping, and the projection of spheres and maps.

Mackey’s article discusses and displays Carleton’s maps of Massachusetts, one of which was eventually printed with state approval, as discussed back here.

The 1795 Boston map captures the town’s post-war transition. Carleton marked the place for the “New State-house” on “State Land.” That new government building would be dedicated that year.

Mackey also discusses how this map didn’t label Oliver’s Dock, though Carleton had used that as a landmark in advertising his school. By 1795 he may have moved to “an unfinished building in Merchant’s Row,” where Robert Bailey Thomas remembered studying under him. Nonetheless, “Oliver’s Dock” was still the official name of that location, preserving the memory of the unpopular royal appointee Andrew Oliver.