An English mahogany sympiesometer, circa 1825
silvered brass plate, mahogany case.
engraved silvered plate inscribed repaired by G.H. & C. Gowland Sunderland and Improved Sympiesometer, sliding scale to the side and recording disc below, rectangular mahogany case with beveled glass panel.
Inscribed at the back; ‘This belonged to Capt. L. D.Heald Rockport Maine’ and a label; Penobscot Marine Museum.
C. Gowland is registered working Sunderland in 1811 and 1816.