Re: Mechanical video recorder
Posted: Sat Jul 27, 2019 6:36 am
Harry, something comes in my mind again. In the 78 rpm-time the cutting needle was used only once, for one disc side. It weared off so much and so fast, that after one disc side it was replaced and discarded. That was the reason that when recording a grammophone record, the disc was recorded from the inner side and spiraling towards the outher side. At the inner side the groove on the disc runs slowest, so the cutting stylus should have the most optimal shape. During the recording process, the stylus weared off and the groove became more and more misformed. But there the groove speed became higher, so the misformation was causing less distortion.
So when recording, record from the inner side, spiraling towards the rim of the disc. I have two of those discs, recorded discs. They were recorded in february 1945 here in Eindhoven, at Philips.
And yes, pressed and bought discs should be played starting at the rim and spiraling in, but that had a totally different reason.
So when recording, record from the inner side, spiraling towards the rim of the disc. I have two of those discs, recorded discs. They were recorded in february 1945 here in Eindhoven, at Philips.
And yes, pressed and bought discs should be played starting at the rim and spiraling in, but that had a totally different reason.