Spot a 'Vulgar Mechanick', how many of them do you know?

"A Vulgar Mechanick can practice what he has been taught or seen done, but if he is in error, he knows not how to find it out and correct it; . . . Whereas he that is able to reason nimbly and judiciously about figure, force, and motion, is never at rest till he gets over every rub"

Isaac Newton wrote to Nathaniel Hawes on 25 May 1694.