Mitchell Map - The Creation of The Map

The Creation of The Map

Mitchell compiled a first map in 1750 from the materials that he could find in London, in official archives and private hands. It proved to be inadequate. Halifax accordingly ordered the governors of the British colonies to send new maps, which most did. These became the basis, when fitted into the overall geographical frame provided by the maps of the French geographer Guillaume Delisle. Late in 1754, Halifax was using one manuscript copy of Mitchell's second map to successfully promote his political position (no compromise with the French) within the British cabinet in the build-up to the Seven Years' War aka French and Indian War. Halifax also permitted Mitchell to have the map published: it appeared in April 1755, engraved by Thomas Kitchin and published by Andrew Millar.

The published map bore the title "A Map of the British and French Dominions in North America." It bore the copyright date of 13 February 1755, but the map was probably not sold to the public until April or even May. Minor corrections to the map's printing plates were made probably during the printing process (for example, the name and address of the publisher were corrected).

The geographer John Green (né Braddock Mead) criticized Mitchell and his map soon after it appeared, emphasizing two failings with respect to Nova Scotia (an area of particular dispute with the French). Mitchell, Green noted, had used neither the astronomical observations for latitude and longitude made by Marquis Joseph Bernard de Chabert in the 1740s nor a 1715 chart of the Nova Scotia coast. In response, Mitchell released a new version of his map, now with two large blocks of text that described all of his data sources; the new version of the map also adjusted the coastline in line with Chabert's work but rejected the 1715 chart as deeply flawed. This version of the map, which Mitchell referred to as the "second edition," is commonly thought to have appeared sometime in 1757, but advertisements in the (London) Public Advertiser and Gazetteer and London Daily Advertiser on 23 April 1756 clearly indicate that this new map appeared at that time.

The map continued to be corrected and some boundaries updated, even after Mitchell's death in 1768, as detailed in Edney (2007).