Microscope – an interesting device! All items under his eyepiece, look not so, as we see them with the naked eye, therefore, it becomes very interesting to look at all underneath. Vinyl records were no exception. With increases in several times can be seen, vinyl that looks just like a concrete wall with notches. Generally microscope – a device, who exactly should be in any audiophile or music lover, not recognizing the digital sound of the warm analog sound. No, Not only that, the sound quality is better, it sounds more detail and softer, than digitized version. Just the sound from vinyl is much more pleasant to the human ear, interesting, more mobile; moreover, it is a whole culture, even fanaticism.

Previously, the only one notch carried the only one channel (mono recording), people have long fought, to record on a record two channels at once (stereo recording). Many different hypotheses have been suggested, including a record of each channel on the opposite sides, but all of them were either difficult to implementing any technology is not yet allowed to do so. How was it done in the end? Here is a quote directly from the source, where I took it all:

But I remember the idea, that even in 1931 he expressed the English physicist Blyumleyn. Then the technology was not yet ready for its embodiment, but 1957 year, it became possible. And that's what advise Blyumleyn. Stereo recording was carried out in a groove, whose walls have been cut at an angle 45 degrees. If recorded in mono was just winding groove, now on every wall was cut out their relief, simulating left and right channel. Thus they are easily read out simultaneously by the head.

The figure shows the groove vinyl with notches on the right and left channel.