Thomas doesn’t know which week it is; thinking there is one more week of term he drags Robin to his garage to test some vacuum cannon upgrades. Thomas and Robin also look back through the podcast’s second season, and forward to a possible season 3.

A Tight Collar

Thomas has been experimenting with the collars that are used to join vacuum cannon spec pipes. After initial excitement (described in the podcast) Thomas does some further testing (described in an addendum) and finds that they don’t seal perfectly when pushed on dry and that the hole in the middle is slightly smaller than a table tenis ball (which probably doesn’t matter). The collars can be cut in to slices to make round flanges with three benefits:

1. Greater surface area for the tape to grip
2. The potential for “reloading” the tape off-line whilst another shot is prepared (one of the issues with the cannon is the pfaff of taping it up in the lesson
3. Easier reloading when you forget the ball!

The slices can also be used as a mechanical support for the “gold standard” flange – if you have managed to persuade tech. to make you them.

Thank you. It’s Been… Emotional

There are so many people to thank. We would not do this without *you* dear listener. The emails we get cheer us up and keep us going. We have had so many guests; thank you to you for giving up your time and being so flexible. (Special mention here to Miss Neutrino who happily rerecorded the podcast after Thomas didn’t press the right button). Thanks to Patrick Kaplo, who has become a good friend and who we were very disappointed not to meet face to face this Spring. Finally, thanks to our families, who think we are bonkers but wave us off to our respective cupboard and garage each week.

…but most of all, thank YOU for taking time to listen and – far more importantly – for teaching physics. We are privileged to teach the engineers, physicists, geologists … of the future, and it’s a future that is a lot brighter thanks to your hard work. Have a great summer!

Join in!

Please share ideas or successes – or indeed questions – on our Facebook Page: https://fb.me/physicstp .  You can also message us via our website contact form at the.physicsteachingpodcast.com, Twitter @physicstp, email using  the address given in the podcast (if we remember), you could even email us an autio file if you are feeling really keen.

Music

• Season 7: Physics Is Our Business by Miracles of Modern Science.
• Seasons 5 and 6: Crescents by Ketsa.
• Seasons 3 and 4: Disco Sheik by Podington Bear.
• Seasons 1 and 2: One legged equilibrist polka by Circus Homunculus.
• Occasionally we also use Cantina Rag by Jackson F. Smith.

The music is used under the Attribution-NonCommercial 3.0 International License