mirror galvanometer

[@RWBHere]

Nice touch at the end of a very interesting history lesson, Norman. Thank-you. Mirror Galvanometers are surprisingly accurate indicators, for something which was developed so long ago. We had a couple at Plymouth Poly, which were made pre-1900. Microamps could be measured with ease, using an ordinary white light source, even with a beam of only a metre or so. But they took several seconds to settle down, because the high levels of damping used. The Kelvin recording reminds me that the oldest recording I've ever heard 'live' was a cylinder of 'The Charge Of The Light Brigade', being read by Tennyson. It was on a cylinder, recorded somewhere in the late 1880's to 1890. Quite an experience to hear it recited in the way in which he intended it to be read.

[@borisromanoff4244]

A wondeful lecture! Congratulations!

[@bixanorak]

Thanks for writing! It rambles on a lot, but gets there in the end... Cheers, Norman.

[@robertfenney]

Excellent video!

[@bixanorak]

Thanks & glad you enjoyed it. Cheers, Norman.

[@ItsRonsway]

as always very interesting video

[@82abn34]

Thank You! Greetings from Ferndale WA, USA.

[@ianhand5006]

Very interesting!

[@bixanorak]

Many thanks & glad you liked the video. More coming! Cheers, Norman.

[@borisromanoff4244]

herr professor: sorry I had no good professors as you are during my college years. thanks Lord it is never late to start learning again.

[@transformingArt]

Fascinating. Thank you for posting this. Also, I didn't realize Lord Kelvin made a recording! Where can I hear the full version?

[@bixanorak]

Thanks for writing. Alas, the Kelvin recording is very poor quality. If you email me via www.early78s.uk I'll explain about it. All the best for now, Norman.

[@RWBHere]

Alexander Graham Bell's assistant made a recording, in which he tells the story of the serendipitous invention of the telephone. It's available online. Do you want to make a video about that subject, Norman?

[@monikapho5673]

very intersecting viedo

[@borisromanoff4244]

herr professor: you are great. you are a born professor. I do like your "classes". you are as good as your partner, professor ludwig von drake.