Abstract: A device for rocking a hammock holding a human is described. The device includes a frame, a lever arm, a solenoid, a cord, and a signaling device. The lever arm pivots about a pivot point to move within the frame. The solenoid is connected to the lever arm to apply a force to rotate the lever arm. The lever arm is connected via the cord to the hammock. As the lever arm moves from one position to another within the frame, the signaling device detects the position of the lever arm and signals to turn on the solenoid to apply a force to the lever arm to rock the hammock.

Abstract: Plating an article in a plating system having a solution at relatively low temperatures is provided. The plating system contains a cathode and an insoluble anode. The plating material can include copper dissolved from small size copper particles placed in a reaction tank. The copper particles are contacted by oxygen in the form of air bubbles. The flow of air to produce the air bubbles can be automatically or manually controlled. The copper particles can be immersed in solution in the reaction tank or, alternatively, desired solution can be controllably sprayed on the copper particles in conjunction with dissolving thereof. Preferably, the weight of the copper particles that can be ionized per volume of the reaction tank is optimized, such as for each particle of a majority of particles placed in the reaction tank, it weighs no greater than 0.001 of the total weight of all copper particles then placed into the reaction tank.