I used them for years
In cargo vessels, the "Lodicator" was an analogic computer used to calculate, essentially the trim, bending and stability based on the weight distribution (fuel, diesel, water and cargo) in the designated spaces. The term was the brand that became a generic name for those computers.
The input was done using mostly two knobs (coarse & fine) for each quantity . For a vessel with seven cargo holds, and around 30 tanks you can estimate how many knobs you had in front of you on the panel.
Once, I had the chance to open it and could see the circuit and the power supply (a big one). And the number of chips all over.
They used lot of power (you could feel it) making the place a warm one.
Once finely adjusted it was always the concern of the Chief Officer that nobody will touch anything there. The premise was; do not touch it and keep it on during cargo operations.
First thing Ch. Officers did after signing on was to see how accurate it was and how close the results were to real life.
They fitted quite well the calculation since the trim is figured out based on the concept of moments which are always referred to the main section (or the aft perpendicular). That goes along well with having a bridge in balance.
Nowadays a PC is in charge. Classification societies require that PC to be used only for cargo calculation exclusively.
The actual use of my two first computers, Timex 1000 and the Timex 2068 was to implement those calculations.