IN NATURE of August 8, attention was called to some recent investigations, published in Hansa, on the inaudibility of fog-horns at sea within certain zones surrounding the signal, although the horn is ...
Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. This patent model accompanied William B. Barker's patent for a fog signal that received patent number 216,820 on June ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback