It was a good instrument, made in Dorp they said, where they are good sailors and grind good lenses.

(We were good sailors in New Viron, too - or thought we were - but did not grind lenses at all.)

They can grind lenses.

Rick tried to concentrate on glasses, but he didn't know anything about how you might grind lenses.

He grinds lenses for glasses.

Both men were interested in astronomy, and having learnt from Morton how to grind lenses, Stirling invented several optical instruments.

He ground lenses in the weak daylight and I watched him, and then I ground mirrors for him (they are easier) as he lectured.

I could grind lenses and only half needed to be thrown out.

I have wasted many hours reading memoirs when I should have been grinding lenses for food money.

Antoni van Leeuwenhoek (1632-1723), a Dutch tradesman, learned to grind lenses and assemble them into simple microscopes.