run separately through the plating process, lined up to match, and subsequently mounted in a press. This recording method was later used to record counter-clockwise discs by Mattel for one of its answers to the GAF Talking View Master in the mid-60s. The dual-sided stereo disc was then played vertically, first in a system that featured two tonearms on the same post facing one another, and later on in an offset system where one tonearm was placed conventionally and the other tonearm was placed opposite, i.e. not only on the other side of the mechanism but facing the other way as well so that both tonearms could start at the edge and play to the center. But, even with playing the disc vertically in a rotating clamp, the same trouble was observed with keeping the two tonearms in their respective synchronous revolutions. The system was developed further however and adapted so that a single tonearm could play one side of a record or the other in jukeboxes of the late 1930s and early '40s. Five years later, Bell Labs was experimenting with a two-channel Lateral-Vertical system, where the left channel was recorded laterally and the right channel was recorded vertically, still utilizing a standard 3-mil 78-RPM groove, over three times larger than the modern LP stylus of the late 20th Century. The trouble with that was, once again, all the low-frequency rumble was in the left channel and all the high-frequency distortion was in the right channel. Over a quarter of a century later, it was decided to tilt the recording head 45 degrees off to the right side so that both the low-frequency rumble and high-frequency distortion were shared equally by both channels, producing the 45/45 system we know today. Emory Cook In 1952, Emory Cook (1913–2002), who already had become famous by designing new feedback disk-cutter heads to improve sound from tape to vinyl, took the two-channel high-fidelity system described above and developed a somewhat misnamed "binaural" record out of it, which consisted of the same two separate channels cut into two separate groups of grooves running next to each other as described above, i.e. one running from the edge of the disc to halfway through and the other starting at the halfway point and ending up towards the label, but he used two lateral grooves with a 500 Hz crossover in the inner track to try and