Note 17 — Humane Institution at Bamborough Castle for the preservation of lives and property from Shipwreck. Signals from the Castle.
Reading edition
The patent signal trumpet (lately invented by Mr. Fitzgerald), to which a pistol or piece of ordnance can be screwed, is said to increase sound to such a pitch as to render the report of a common cartridge, fired through it, equal to that of a nine-pounder. Such an instrument therefore may prove highly useful to mariners in distress. Repertory of Arts, Vol. XI. p. 100.
As might also the Telegraph, which is now so much improved as to give signals by night, as well as by day.