This is how he puts it.
The law of inertia had originally required a thought experiment to posit a law of mechanics not found in nature. p. 9
The development of inertial mass is claimed to have had nothing to do with gravity, and plays no role in the experiment. p. 35
It required the same thought experiment, however, to set aside gravity to determine inertial mass as it had to develop the law of inertia itself.
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