Abstract: A waterproof coupler having a casing and a cap to form a junction box for enclosing a junction between a plurality of electric conductors. The casing has a single opening to enclosingly receive the junction. A plug member constructed of resilient material defines passages therethrough for the conductors. The member is adapted, when compressively urged by the cap into sealing position with the opening, to simultaneously seal the casing and the junction between the conductors. The bare ends of the conductors are anchored by solder balls to a disc positioned inside the casing.

Abstract: A geophone case with an improved internal cable anchor. The anchor has three parallel bores extending in a longitudinal direction for tightly accepting a cable therethrough, whereby the cable makes two 180.degree. bends which provide the necessary reaction force to the cable.