This gage consists essentially of a grid of fine wire cemented to a paper membrane, which can be attached to the surface under investigation. The ends of the wire grid are spot welded to a metal strip for the terminal connections. The use of these gages depends upon the fact that certain alloys show a linear relationship between applied strain and electrical resistance, so that if a wire constructed from one of these alloys is fixed to the 1062 surface of an object subject to variable strain, the change of resistance in the wire will be a measure of the change of strain in the object.