Here is a quote from the link: "The record groove is an analog of a sound wave. Try to picture looking down on a narrow river or stream. The left bank is the left channel and the right bank is the right channel. Your turntable’s stylus is a wide round raft that is going to travel that river".
I am puzzled by this statement. If the lathe used to cut the grooves in the master steel blank has just one cutting tool on it, how would it cut information on one half side of the groove different from the other half? Is this really how a stereo record works?
I thought that the groove was a blend of the stylus moving back and forth, as well as up and down (horizontal and vertical vectors) causing the stylus and then the cantilever and pole piece to oscillate between the four poles, creating the stereo effect.
If someone is an Expert on this topic, I would like a good explanation as there seems to be a problem with the initial explanation.
W
