What is the origin of the word 'payload' and in what historical context was it first used?

by TLDR_Meta_comment

I found this but it seems to pose more questions than answers: http://english.stackexchange.com/questions/181727/how-was-the-term-payload-coined

Searocksandtrees

hi! while you may get answers here, it may be worth x-posting this question to /r/Etymology