Applause Meter, Hindi bol (1965)

Ameen Sayani, in his typical "Bhaiyo aur Behno" style introduces the song "O Mere Pyar Aaja" by Lata Mangeshkar from and in the film Bhoot Bungla (1965).

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Probably the first onscreen invocation of the still popular line "Hindi may bol!". We hear it all the time when someone wants you to speak in plain hindi.
In this clip we also get to see a thing called Applause Meter. Apparently these "taalimeters" were quite popular in those days.

This one was by Avery. I think it was made by these folks.

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previous related post: Ramu Maali of Bhoot Bungla