A disc ruled with radial line is used 2 check d turn-table speed of transcription...
A disc ruled with radial line is used 2 check d turn-table speed of transcription...
A disc ruled with radial line is used 2 check d turn-table speed of transcription untill 4 playing record at 66/2 rev/min.if d disc appears stationary when viewed in d night from a neon discharge lamp run from a 240v, 50Hz a.c.supply should be
(a) The angle btw lines
(b) the total num of lines?
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