Set the clock to the correct time by using the minute hand only. It is best practice to move it in a clockwise direction and only when the pendulum is at, or about to reach, an extreme in its swing, or is locked. Do not touch the hour hand or move the minute hand backwards on an Atmos clock. When the summer comes in the Spring to change the clocks for British Summer Time, just stop the clock with the lever, when the pendulum stops moving, and move the minute hand forward by an hour. In the Autumn it is easiest to just stop the clock and restart it after an hour has passed.