Clock with simple summer-time changeover - has inner case tiltable by 30 degrees to advance or retard the time by one hour

摘要

The clock has conventional hands, and a face with 12 hour marks but no numerals. The inner case of the clock is formed with an angle between its base and one of its sides of only 60 degrees. During winter-time, the base of the iner case is horizontal. When the changeover is necessary, the inner case is tilted to the right until the side is vertical, and thus the hour had moVed forward oe hour. If the minute hand is moved fiVe minutes in the opposite direction to the tilt movement, the clock will be correct until the process has to be reversed at the onset of winter-time.