Travel clock
With the invention of portable clocks in the 16th century, the travel alarm clock became mobile thanks to the spring as an energy accumulator and the steering wheel . In the 1920s, travel alarm clocks were mass-produced with increasing mobility. At first resembling the travel alarm clocks of earlier eras, they were covered in an elegant case that protected the watch while traveling. At night the watch was taken out of its protective case and placed on the bedside table. Later, the machinery was permanently attached by a hinge to the pouch-like sheath. So the case not only protected the alarm clock, but was also its support.