Extract of a letter written by Signior Borelli, about the price of his telescopes; Communicated to Sir Jonas Moore

The said worthy person saith, that although he did hot at first intend any more than to present his Glasses to some of the most famous Astronomers; yet being earnestIy soliicited by his Friends from many parts, he offers to rate the price of them, according to what the most known Artists, such as Campani and Divini, have done who both have commonly sold their Glasses at the rate of a Pistol (i. e. about 17 shillings and fix pence ) the foot.