What piece of local folklore is often cited as an explanation for why Macmillan suppressed public demonstration of his invention?

Answer

He allegedly knocked over a young girl in Dumfries and received a fine

Local tradition suggests that after riding into Dumfries and causing an accident resulting in a fine, Macmillan was embarrassed or legally troubled enough to abandon further public development of the machine.

What piece of local folklore is often cited as an explanation for why Macmillan suppressed public demonstration of his invention?
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