30/123 At last he gave up teaching, and took to telescope making. He advanced step by step; and like a practical, thoughtful man, he invented special tools and machinery for the purpose of grinding and polishing his glasses. He opened a shop in York, and established himself as a professed maker of telescopes. He added to this the business of a general optician, his wife attending to the sale in the shop, while he himself attended to the workshop. They were not only better manufactured, but greatly cheaper than those which had before been in common use. |