In the Marine Room Collection of the Peabody Museum at Salem, is a spy-glass four feet long, octagonal in form, two and one-half inches in diameter, with a short focusing tube. It was taken from a British prize vessel off the coast of Ireland, in 1779, by Capt. James Barr in his Salem privateer. Another glass of similar form, but longer and with a mahogany case, was used on a United States naval vessel about 1815. The spy-glass, familiar to everyone, in two or three sections, was used at sea through the first half of the nineteenth century and is often seen tucked under the left arm, in the portraits of ship-masters brought home from foreign ports. Many of these were excellent instruments, especially those from Dollond of London. There is also in the Salem collection a rude telescope or spy-glass five and one-half feet long with a copper case about three inches in diameter looking precisely like a section from a house water-conductor. It focuses by a small upper sliding section, fitted like a stove funnel. This glass was brought from Nagasaki, Japan, by a Salem ship-master about 1865. It had been used there to observe vessels coming into the harbor. It may be Dutch and it is evidently very old. [Illustration: SEXTANTS IN PEABODY MUSEUM, SALEM 1. "Bradford London." Brass frame and silver scale arm 14 inches long, _ca._ 1815, used by Capt. George Bailey before 1840. 2. "L. Bleuler, London." Ebony frame, ivory scale, brass arm 14 inches long, _ca._ 1820, came from Plymouth, Mass. 3. "G. Gowland 76 Castle St. Liverpool." Used by David Livingstone in his African explorations and after his death sold at Zanzibar by order of the Royal Geographical Society and bought by Capt. William Beadle, of Salem, and used on some of his voyages.]