Burning Christmas tree lamps in multiple

No little disappointment and inconvenience is often caused by the burning out of one lamp of a series-connected Christmas tree lighting set, resulting in the darkening of all of the lamps. The defective lamp is sometimes found only after testing all of the lamps on the tree. This sometimes involves considerable trouble. A transformer designed for use with Christmas tree lighting sets and with electrical toys, eliminates these difficulties by permitting the lamps to operate in multiple.