Patent ID: 7236430

Claim:
A system for teaching elapsed time comprising: a teacher clock including: a clock face; a minute hand pivotally mounted to said clock face; an hour hand pivotally mounted to said clock face and connected to said minute hand such that pivotal movement of said minute hand about said clock face causes said hour hand to pivot synchronously therewith to designate a progression of hours, whereby said minute hand and said hour hand are selectively positionable to display a time of day; and an elapsed time display having a releasable connection connected to said minute hand, such that said elapsed time display resets to an initial position upon release of said releasable connection, whereby an elapsed time is shown by said elapsed time display as a result of movement of said minute hand and said hour hand between any two selected times of day on said clock face; a student clock including: a clock face; a minute hand pivotally mounted to said clock face; an hour hand pivotally mounted to said clock face and connected to said minute hand such that pivotal movement of said minute hand about said clock face causes said hour hand to pivot synchronously therewith to designate a progression of hours, whereby said minute hand and said hour hand are selectively positionable to display a time of day; and an elapsed time display adjustable independently of said student clock minute hand; wherein said minute hand and said hour hand of said teacher clock are adjusted to show a first selected time of day and said elapsed time display is reset, and said minute hand and said hour hand of said student clock are adjusted to show a second selected time of day, such that a student may determine an elapsed time between said first selected time of day and said second selected time of day and display said determined elapsed time on said elapsed time display on said student clock; and wherein a verification elapsed time is obtained by adjusting said minute hand and said hour hand on said teacher clock to correspond with said second selected time of day such that said elapsed time display on said teacher clock displays said verification elapsed time.