Abstract: An apparatus for measuring dynamic magnetostriction subjects a test sample to a spatially uniform, sinusoidal magnetic field of constant peak amplitude. Accelerometers mounted on the test sample produce a first electrical signal representative of the acceleration of the test sample due to the induced magnetic field. The first electrical signal is integrated twice producing a signal representative of the displacement of the test sample due to the induced magnetic field. This signal is representative of the magnetostrictive movement of the test sample.

Abstract: A hydraulically operable elevator having a vertically reciprocable cab suspended from an overhead structure by differential hydraulic piston systems which are responsive to introduction of hydraulic fluid to decrease the overall length of the differential pistons causing the cab to ascend, and which are responsive to withdrawal of hydraulic fluid from the piston assemblies to increase the overall length of the differential pistons, allowing the cab to descend. Only one differential piston assembly is required on each side of the transverse axis of the cab to increase its stability and to provide maximum cross-sectional area for the interior of the cab.