Waves and Vibrations - with Sir Lawrence Bragg

The reflection of waves is described and their expansion and compression is then illustrated experimentally. Sir Lawrence demonstrated the effect of waves crossing each other and explains this effect with the aid of models and animated diagrams. The Doppler Effect is described and illustrated dramatically by means of ASDIC recordings. Finally, Sir Lawrence considers and demonstrates the effect when a body is travelling through a medium faster than the waves travel in that medium.
From the original programme notes:
Sir Lawrence Bragg at the Royal Institution of Great Britain Since 1826 a series of lectures, planned for young people, has been given at the Royal Institution during the fortnight after Christmas. These lectures, 'adapted to a juvenile auditory' to use the nineteenth-century phase, were started as a new venture in science teaching. It is the tradition to illustrate the CHRISTMAS LECTURES with numerous experiments which are on an impressive scale and as far as possible of a novel type. Many experiments first shown in the Royal Institution theatre have become classical bench-experiments in schools and colleges, and many of the best popular scientific books have been based on CHRISTMAS LECTURES. A scheme was launched in 1955 to give corresponding lectures throughout the school year, because it seemed very desirable to use the facilities and traditions of the Institution to the full and thus make it possible for a larger audience to participate. The idea was proposed in the first place to a few science teachers in schools, and with their help it was started in a small way. The lectures had an enthusiastic reception, and the scheme soon grew to its present proportions – over twenty thousand young people now come to the lectures each year. The main idea behind them is to show experiments, illustrating the basic principles of science, which are on too large a scale or involve too complicated apparatus to be readily staged with school resources. The majority of the lectures are on physical subjects, but chemistry and biology are also represented.
In 1965, Lord Bowden, who was then Minister of State in the Department of Education and Science, expressed a wish that the lectures given by Sir Laurence Bragg be recorded in the form of films, and arranged that a sum of money be earmarked for that purpose. The series Sir Lawrence Bragg at the Royal Institution is the result of his interest. The films have been commissioned by the Educational Foundation for Visual Aids and shot on the premises of the Royal Institution. At first an attempt was made to film the actual schools' lectures, but there were a number of drawbacks to this procedure. Ideal positions for the cameras were not possible in a crowded lecture room. An hour's talk is too long, the film had to be divided into three or four sections, and it was not easy to tailor beginning and ends to the sections. It was finally realised that it would be much better to shoot each film as a separate project, with no audience and complete freedom for the camera team to take the long shots and close-ups in the best way. The possibility of close-up shots is a great advantage, because it enables effects to be shown which it would be impossible to demonstrate in a large lecture room. The present series consists of sixteen films covering the schools' lectures dealing with magnetism, the properties of matter, and vibrations and waves. It is hoped to include electricity and other subjects in a further series. In the main, the experiments are those actually shown in the schools' lectures, modified for filming where desirable. The action before the camera is in each case carefully rehearsed so that the performance of the experiment is seen as clearly as possible. No attempt however has been made to prepare a 'script'. The talk is quite informal, not a prepared one, in the belief that it will be fresher and more interesting if given in this way. It is hoped that the imperfections, inevitable in an impromptu talk, will be overlooked for the sake of its more personal nature.
Crown copyright information is reproduced with the permission of the Controller of HMSO and the Queen’s Printer for Scotland.
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[@Raphi]

I was initially hesitant to use this video because I thought it was old and therefore outdated. I'm happy I watched though. In many ways the older the video, the more clear and closer to the roots it is

[@wrichik_basu]

Those are great demonstrations. These videos should be shown in schools as an aid to teaching. They would make learning physics more interesting.

[@nguyenhoanglong420]

Make mistakes a lot is how you learn

[@MasterMindmars]

Incredible way to show the physics phenomena. But mechanicaly with solid pieces. Never saw this physical fenomena in a real way, not virtual, drawed or video animated.

[@tomdrowry]

Amazing to see a scientist from a long gone era in such clarity.

[@halonothing1]

You should look up Engineer Guy's presentation of Faraday's Christmas Lecture on candles if you like this.

[@AaronHollander314]

Much better than borrowing money in student loans.

[@leperzemog1153]

Thank you for uploading all these videos

[@sketchin1009]

I love the zenacomb model he used... I struggled to imagine what caused reflected and standing wave behavior. Bravo!

[@pauloshea3741]

It's so scary that most people don't even understand the technology they take for granted, and which their lives so depend on!

[@thailander5572]

i enjoy lecture a lot. it's fun to watch with many science-devices operation. i wish my school had tools like this for student

[@pushkaranim9725]

hats off

[@nelsonpalraj]

Very good lectures indeed, thanks a million for uploading thsese videos. Thank you sir

[@dramida]

very good, thank you sir

[@HCBCHEMISTRY]

Beautiful. Brilliant.

[@zeph6439]

@5.16 Sir Lawrence is showing the key to a more fuller understanding of the ancient Egyptian hieroglyphic language.

[@MrGiedriokas]

This nigga never disappoints lit stuff my dawg keep it up

[@jayprakashmishra3624]

Great techniques Sir. If I were your student.

[@aneeshyr]

Never knew Adobe archived these educational videos

[@COMPTROL]

Gosh, what is the date of recording? How can’t you write this info?

[@frankculaga5169]

How old is this film? Lawrence Bragg died in 1971.

[@jeremiahmullikin]

Is this the discoverer of Bragg's law of x-ray diffraction?

[@debismitadutta7083]

Yep

[@sammin5764]

🌹🎖

[@adriangheorghe2327]

Asa zisele unde E-M sunt doar o aparenta. In vid nu functioneaza mecanismul undelor, care cere transformarea succesiva a energiei unui camp in energia celuilalt.sinfazarea campului electric cu cel magnetic arata ca in vid nu functioneaza mecanismul undelor. Rezulta ca in vid nu avem nicio vibratie, este numai translatie. The so-called E-M are just an appearance. In vacuum, the wave mechanism does not work, which requires the successive transformation of the energy of one field into the energy of the other. It turns out that in vacuum we have no vibration, it's just translation.

[@punman5392]

Mr Coates might be tone deaf