You can read a copy of my latest maple history contribution to the March 2021 edition of the Maple Syrup Digest (Vol. 60, no. 1), the official publication of the North American Maple Syrup Council , at this link or by clinking on the image below.
This article describes the designs, technology, and patents of the first evaporators for making maple syrup and maple sugar in the late 1850s and early 1860s and the men that were responsible for their introduction. Evaporators provided an advanced, faster, and more efficient way of reducing maple sap to syrup and sugar than the flat pans they replaced and were one of the most important technological advancements in the history of the maple syrup industry.