On this day in 1937 Gerhard R. Fisher was granted the patent for METALLOSCOPE. U.S. Patent No. 2,066,561.
This patent relates to metalloscopes, a method and means for indicating the presence of metals that are buried such as ore, pipes, or the like.
An object of the present invention is to provide a simple apparatus which is preferably unitary and which is entirely portable, for instantaneously indicating the presence of metal, such as buried ore, pipes, or the like.
This is accomplished by generating electrical waves in balanced relation to a receiver, whereby the balanced relation is upset when the apparatus is brought into the vicinity of a metallic body, this unbalanced condition arising from the fact that the field is generated in such a way that the metallic body affects one portion of the field more than it does the other.
