Abstract: A fluxgate magnetometer includes a body of magnetic material, a drive coil and a sensing coil. At least one of the drive coil and the sensing coil is composed of two portions, each of the two portions being disposed in generally parallel planes which are spaced apart and respectively include an electrically insulating substrate and a spiral shaped portion which is electrically conductive supported by the electrically insulating substrate, the two portions being electrically connected such that electric current flows in the respective spiral shaped portions in opposite rotational senses relative to the body of magnetic material.

Abstract: An impact fuze arrangement for a missile in which an electromagnetic field is set up within a compartment in the body of the missile and a warhead detonating signal is generated if the field intensity varies by more than a predetermined amount, as will happen due to distortion of the compartment on impact of the missile on a target. Fields may be set up within a plurality of compartments and warhead detonation may be made conditional on distortion of more than one of these compartments.