Final answer:
Old-fashioned pocket watches stored energy in a mainspring when wound, using the potential energy to power the watch. Through time, various devices have kept track of time, leading to smartphones that do much more. Technology's influence will persist, shaping future timekeeping devices.
Step-by-step explanation:
Old-fashioned pocket watches used a mechanical movement that stored energy when wound. The energy was stored in a spiral spring called a mainspring. When wound, the mainspring would coil tighter, storing potential energy which would then be gradually released to power the watch movement, thus keeping time.
Throughout history, various timekeeping devices have been used such as calendars and mechanical clocks. Remarkable historical examples include the Elephant Clock designed by al-Jazari in 1315 and the more modern concept of the 24-hour clock format reflected in our daily lives, shaping our perception of time even in our interactions with digital devices like smartphones.
Today, smartphones and other devices provide functionality beyond just timekeeping, often including the date and various other applications, signifying the impact of technology on our daily lives and how it will continue to evolve into the 23rd century and beyond.