123. Metal Mine Probe (Sucheisen)

The metal mine probe (fig. 153) is about 1 foot long with one end bent into a circular handle and the other end tapered to a fine point.

Figure 153. Metal mine probe.

124. Mine Probing Rod 39 (Minensuchstab 39; M.S. 39)

a. Description. The mine probing rod 39 (fig 154) consists of an extension piece and a vibrating tube containing a hardened steel point. The extension piece is joined to the vi-brating tube by means of a bayonet fitting, when the probing rod is to be used from the standing position. The total weight of the assembled probing rod is about 1 pound. In shipping and for carrying, the point is inserted in the extension piece.

b. Operation. The rod is held lightly between the fingers and thumb and inserted vertical-ly into the ground. If resistance is encountered, the point should be lifted approximately 4 inches above the ground and dropped again at the point where the resistance was en-countered. A skilled operator can tell the nature of the object contacted by the action of the rod and by the sound emitted by the vibrating tube. The point will stick in wood and the vibrating tube will emit a dull note which will be barely audible. Metal will cause the rod to rebound and give out a high note. Rock causes the rod to rebound sharply and to produce a high, almost shrill note.

Figure 154. Mine probing rod 39.