p. 7 | Taking Soundings by Sound Waves

Pacific Press Publishing Company · Mountain View, California · Apr 11, 1906

FromSigns of the Times, Vol. 32, No. 15.

Taking Soundings by Sound Waves

A new and ingenious and highly practical method of taking soundings at sea has just been completed by H. Berggraf, of Norway. He does not use the line and lead, but employs sound waves to ascertain the depth of water. It is the principle of the echo turned to the life-saving service. The length of time it takes for the sound of a bell to travel from the side of a ship to the bottom of the sea and return, tells the depth of the water. Delicate instruments are required to make these soundings absolutely accurate.