—Page [98]: "This beautiful contrivance, which is incontestibly" has been replaced by "This beautiful contrivance, which is incontestably".
—Page [100]: "the working beam no longer used" has been replaced by "the working beam is no longer used".
—Page [223]: "is attended with peliar difficulty" has been replaced by "is attended with peculiar difficulty".
—Page [271]: "The projecter is now employed in" has been replaced by "The projector is now employed in".