"The balance shown here was made in 1720, by Johann Ernst Elias Bessler (1680- 1745), (known as Orffyreus, and notorious for his "Wheel" or perpetual motion machine) for the military engineer Johann Adam Cass of Kassel".
There is also a picture of the same instrument in "Die Naturwissenschaftlich-Technischesammlung" by Ludolf Von Mackensen (Kassel: George Wenderloth Verlag, 1991).
In 1720 Cass published a book called "Neu verbesserter Ingenieur" which means "New Advanced Engineering", In 1722 he published "Nouveau corrige ou par des demostrations guide de l'ingenieur à la veritable mathematique",meaning "New or corrected by demonstration, Engineering Guide to mathematical truth". These publications were sponsored by Karl, the Landgrave.
The hydrostatic balance was a frequent component of perpetual motion designs and is still sometimes introduced as part of the mechanism. Bessler seems to have included them in some of his Maschinen Tractate designs
I have also included the concept in my own designs from time to time but in the end I prefer the simplicity of weights, but are we denying the potential benefits of a the hydrostatic balance? I don't think so.