bob012345 said:
I’m not looking for Sci-fi ideas from the Steampunk genre. I’m looking for original thought among PF members regarding what such an advanced civilization might look like now.
Asking STEM members to pretend electromagnetic (EM) theory and 'electricity' never existed, constitutes what engineers might call a self-defeating criteria.
Much of modern physics derives from studying EM, particularly light. Ignoring such undermines the basis of PF's role as teachers. Would relativity exist without Maxwell's equations as basis?
After the fact, we could speculate on IDK, matter and gravitational waves as
post facto basis for quantuum mechanics but not in 1925. Certainly electronics provides sensitive measurements beyond strictly mechanical means; e.g. interferometers versus beam balances.
Thus I mentioned old-timey SF sources such as "The Waveries" to provide some basis for the speculation, not to mention more modern steampunk civilizations. IOW we know about EM but cannot or do not use it for some SF-logical reason.
Otherwise, speculating on a purely mechanical technological civilization contains merit. Look to tech history for many examples of non-electrical devices.
While brushing my teeth with an electronic toothbrush, I mentally designed a purely hydraulic toothbrush powered by water pressure at the tap, not to mention a 'water pick', as improvements to a basic toothbrush. Likewise, engineers in rural Africa and Asia designed clothes and dishwashers powered by water pressure sans electronic controls due to lack of a consistent electric grid. Members have already provided a plethora of mechanical technology.