Citation - New York Gazette & Weekly Post Boy: 1759.12.10

NYGWPB.759.087
10 Dec 1759:33 (884)
This is to give notice that the Violin and German Flute, are
taught by Messrs Van Dienval & Hulett, at Mr. Proctor's
Watch-Maker, the corner of French Church Street, opposite
Mr. P. Philips's, where constant attention is given from
twelve to eight in the evening; the morning being devoted to
attend those gentlemen that chuse to be taught in their own
houses.
N.B.  Mr. Proctor likewise teaches the harpsichord, and
gives the same attendance.