An example of an analogy in popular science writing:
"Thermionic valves became the mainstay of telephony in the first half of the twentieth century, enabling global communication via cables or wirelessly with the use of radio waves.
There's an analogy here to the early days of steam. Remember how inefficient engines were then, wasting well over 90 per cent of the heat they produced. Not knowing how to improve them, people burned more coal. The thinking behind thermionic valves was similar, for they didn't reduce noise levels so much as raise the strength of signals so they were no longer swamped. In both cases, engineers were pumping more energy into the system to overcome the waste of most of it."
Paul Sen (2022) Einstein's Fridge. The science of fire, ice and the universe. William Collins.
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