America's Munitions 1917-1918

The cover image was created by the transcriber and is placed in the public domain.
FRONTISPIECE.
THE END OF THE WAR.
A GRAPHIC RECORD.
One minute before the hour.
All guns firing.
Nov. 11, 1918. 11 A. M.
One minute after the hour.
All guns silent.
This is the last record by sound ranging of artillery activity on the American front near the River Moselle. It is the reproduction of a piece of recording tape as it issued from an American sound-ranging apparatus when the hour of 11 o'clock on the morning of November 11, 1918, brought the general order to cease firing, and the great war came to an end. Six seconds of sound recording are shown. The broken character of the records on the left indicates great artillery activity; the lack of irregularities on the right indicates almost complete cessation of firing, two breaks in the second line probably being due to the exuberance of a doughboy firing his pistol twice close to one of the recording microphones on the front in celebration of the dawn of peace. The two minutes on either side of the exact armistice hour have been cut from the strip to emphasize the contrast. Sound ranging was an important means of locating the positions and calibers of enemy guns. A description of these wonderful devices, which were a secret with America and the Allies, is given in Book III, chapter 4.

REPORT OF BENEDICT CROWELL