Subject: In early elevators how did the power source know the required level
Date: Fri Apr 15 08:02:42 2011
Posted by Steve
Grade level: grad (non-science)
School: No school entered.
City: No city entered. State/Province: No state entered.
Country: No country entered.
Area of science: Science History
I need to know how the most primitive of elevators worked (e.g. those powered
manually or by steam etc). For example, when a person got into the elevator
car on the top floor how did they communicate to the power source which floor
they required. Thank you
Re: In early elevators how did the power source know the required level
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