Conversation so far:
When did the first engines come about?
In 1776, the first engines were installed and working in commercial enterprises.
How did the engines work?
engines were used to power pumps and produced only reciprocating motion to move the pump rods.
Were the engines a success?
The design was commercially successful.
Did they keep making more engines?
for the next five years Watt was very busy installing more engines.

Question: Where were the engines being installed?
Self-contained rewrite: Where were the engines  by James Watt being installed?