Over the next few months I'll be posting scans of a booklet published in 1920 by the Submarine Signal Company, a Boston-based company that designed various ASW devices including the C-tube and K-tube hydrophones used on submarine chasers.
Posted this month is the first segment, describing the development of submarine bells, and the technology of the Fessenden oscillator.
--Todd Woofenden, Editor
Submarine Signaling: First part
Posted this month is the first ten pages of the booklet, Submarine Signaling, by Gordon Dexter, president of Submarine Signal Company.
SC 338 photo added
Added to the SC 338 page is a photo of the chaser underway, possibly early post-war.