Complete the following sentence: Hammer's incandescent light bulb collection from around the world was titled "The History of an Art" and he exhibited it at various times in electrical expositions and shows. •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• When he presented his collection at the
1904 St. Louis World's Fair he was awarded the Grand Prize.