This is the Edison clock, designed by [David Krawczyk ... These have a small light bulb socked in each, and correspond to hours and 5-minute increments. Insert two bulbs to set the alarm time ...

Edison got serious about electric lighting ... Tungsten filaments have a low resistance when cold, which causes a bulb to draw a lot of current when it first turns on. As the filament gets hot ...

Thomas Alva Edison, the man behind the electric bulb has been a well-known inventor for more than a century now. It is primarily thanks to his incredible demonstration on a chilly New Year's Eve ...