Public domain photos

The image shows a black and white drawing of a clock with a pendulum, which is believed to be a mechanism used to measure the speed of an object. The diagram accompanying the drawing provides further details about the mechanism, such as its purpose and how it works.

The image shows a black and white drawing of a clock with a pendulum, which is believed to be a mechanism used to measure the speed of an object. The diagram accompanying the drawing provides further details about the mechanism, such as its purpose and how it works.Open in library