1940's Advance Electricity Shocker Machine. Advance built penny arcade machines which gave electric shocks from the late 1920's up until around 1950. The machines remained in common use until the 1960's when the apparent danger of such machines to people with pace makers or other medical concerns was noted. This machine entices players by trying to setup a competition to see who can take the biggest jolt. A penny is inserted and the two silver knobs are held, one with each hand. The right hand slowly twists the right knob increasing the voltage (indicated by a mechanical guage on top) until the plater can take no more. Even though the electricity is high voltage, extremely low amperage, thus staying near the skin, the actual jolt felt is quite strong. This is definetly not a game for the weak of heart! A internal six volt battery provides power to a vibrator and step up transformer coil. The battery would have to be changed quite often on location. This machine has the very hard to find instruction marquee on top.