Found this....
This is a "modern", bizarre, Masonic drawing board. Drawing boards, with all of the symbols pertaining to a degree, have become obsolete with projectors. The high tech in your grandfather's lodge: the magic lantern, an early slide projector often with hand painted slides.
What were people's ideas about the universe
This has some less famous brothers in the pic. Pretty sure John Theophilis DeSaliguers is there on the bottom left, and it looks like Isaac Newton on the upper right. Their views are published, especially Newton.
Ooo very good..