Abstract: A method and apparatus for harvesting energy comprising determining an electrical impedance of a piezoelectric stack, connecting an electrical load to the piezoelectric stack wherein the piezoelectric stack is housed in a mechanical amplifier comprising a fixed supporting member, a movable supporting member connected to compliant links attached to at least one actuating arm, and connecting the actuator to a source of motion whereby movement of the actuating arm results in compression and expansion of the piezoelectric stack, which generates electrical current into the electrical load.

Abstract: An apparatus adapted for use in moving objects, such as mired vehicles, removing submerged or grounded boats from their mired condition and pulling them up on land to be repaired or loaded on trailers or the like, moving small buildings, etc. The apparatus is endowed with unusual versatility for it is adaptable to a great many uses. In many use circumstances the apparatus may be carried in a vehicle or the like for emergency use since it is composed of relatively few components so that under these circumstances it is in effect a portable kit. The components forming the apparatus may be easily set up into operative condition and operated by one person to perform its function. The puller apparatus comprises a fixed element which may be removably embedded in the ground in certain use circumstances and in other uses may be removably attached to a stationary member.