In this video I have uploaded Eric Laithwaite's 1974 lecture titled Jam Yesterday, Jam Tomorrow. This is the third of his series of Christmas Lectures at the Royal Institution, and which are in Eric's typical Alice in Wonderland theme. In this third lecture, Eric explores forward and backward motion in both sound and video, which he uses the then state-of-the-art replay cameras to demonstrate. He also shows how technology can be further used to slow down fast moving processes such as the flapping of a hummingbird's wings, or speed up slow processes such as the movement and formation of clouds. Eric explores supersonic flight and explains how the plane controls and designs are mirror images of those for subsonic flights. Lastly, Eric demonstrates a mechanical analog for the microscopic world by showing that iron filings under an alternating magnetic field mimic the random gas particle motion known as Brownian motion.

Watch more Eric Laithwaite lectures: [ Ссылка ]

The links to the original videos on the Royal Institution website are shown below:

- Lecture 1: [ Ссылка ]
- Lecture 2: [ Ссылка ]
- Lecture 3: [ Ссылка ]
- Lecture 4: [ Ссылка ]
- Lecture 5: [ Ссылка ]
- Lecture 6: [ Ссылка ]

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