How did Tesla measure electromagnetic fields, etc?

AI Thread Summary
Tesla utilized basic tools like compass needles to measure electromagnetic fields, relying on earlier work by C.F. Gauss published in 1832. The precision of measurements improved with the development of electromechanical instruments, such as moving coil multimeters, which are still in use today. By the early 20th century, the introduction of vacuum tubes enabled the creation of simpler versions of modern electronic instruments. By World War I, advancements allowed for more accurate devices like wavemeters, which Hertz used to measure spark lengths in resonant loops. Overall, the evolution of measurement techniques significantly impacted electromagnetic field studies.
Macoleco
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He didn’t have the modern equipment we have today.
 
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You can be reasonably precise with variations on the compass needle.
A lot of work was already done by C.F. Gauss and published in 1832.
https://www.jstor.org/stable/pdf/110344.pdf
 
It depends a bit on the time period since Tesla was active when many of these instruments were developed. Quite a instruments can actually be built using electromechanics (Moving coil multiimeters are still used) and once you introduce vacuum tubes (early 20th century) you can build simple versions of many "modern" electronic instruments.
By WWI you could e.g. get pretty good wavemeters etc
 
Hertz did it by measuring the length of spark at the receiver, which was a resonant loop with a spark gap.
 

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