Some thoughts: This could not have had very much precision - you can’t wake up at 725 if your neighbor is up at 715. The knocker uppers client base would be l

Some thoughts: This could not have had very much precision - you can’t wake up at 725 if your neighbor is up at 715. The knocker uppers client base would be limited by the density of housing and their walking speed. With today’s suburban housing there’s no way to access everyone’s bedroom windows and walk from client to client. Even in urban areas, buildings must have eventually been too tall for a stick to reach.