Col. Engineer Römer’s 1698 Memorial – Found a clue!

I found a clue and following it up, back to England we go!


Image: Magnifying glass on antique table. https://commons.wikimedia.org/wiki/File:Magnifying_glass_on_antique_table.jpg By Stéphane Magnenat (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (https://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons