Compact Mechanical Energy Source
In my late-Victorian world there are independently moving automata that may act as pets or servants to those that can afford them.
They require a fair amount of energy to run at full capacity, enough to move two arms (<500g lifting power), move itself on wheels and power various instruments such as speech and processing (such as a primitive voice assistant).
Typically they are 80-160cm tall, 40-80cm wide and humanoid from the waist up and typically made of various alloys and fabrics.
The amount of space available is restricted by control mechanisms and additional storage or instruments, using 25-75% of the available space depending on the automatas functions.
These systems do not usually contain any electrical workings and fine mechanics is advanced and reliable enough to replicate integrated circuitry.
How can I power these machines for a longer period of time?
It should be able to run for at least 6h at full energy usage.
The energy source should be self-contained, but needn't be entirely safe to the public as insurance is covered.
This post was sourced from https://worldbuilding.stackexchange.com/q/147843. It is licensed under CC BY-SA 4.0.
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