This question has been closed: https://physics.stackexchange.com/questions/688998/how-was-mass-increase-measuredMeasurementhttps://physics.stackexchange.com/q/688998/ because:
I’m voting to close this question because it concerns the history of physics – Bob D
and then:
Closed. This question is off-topic. It is not currently accepting answers.
I have been around for a few years and have never heard anything so weird.
There are loads of questions bordering history, but mine does not:
- Who (and Why) started the "electrons are negative, protons are positive" convention?Who (and Why) started the "electrons are negative, protons are positive" convention?
And many more concerning past experiments:
- How to measure the mass of the electron?How to measure the mass of the electron?. I have chosen two examples answered by an illustrious member, and I hope there was no discrimination.
As I clearly explained, the question was absolutely legitimate, since in 1894 the mass spectrometer was not yet available and Thomson had not even discovered the electron. Is that really off-topic?