Devoting himself next to optics, he produced memoirs which entitle him to a high place among the early, searchers after a true dynamical theory of light.
While his patroness lived in a convent of her own in Jerusalem, Rufinus, at her expense, gathered together a number of monks in a monastery on the Mount of Olives, devoting himself at the same time to the study of Greek theology.
Her husband, uxorious and devoting, delievered breakfast in bed to her on every weekend.
Several companies are devoting all their energies to zinc extraction, and the output is now equal to about 5% of the world's production.
He now employed himself in making optical glasses, and in engraving on metal, devoting his spare time to the perusal of works on mathematics and optics.