Wikimedia Commons picture of the day for August 28
TDK tape head cleaner cassette “HCL-11” made of clear hard plastic. The plastic is birefringent and demonstrates internal stress as coloured patterns (photoelasticity) when photographed using cross-polarisation. Invented by Lou Ottens and his team at the Dutch company Philips, the Compact Cassette was released on this date in August 1963.
Source link
Leave a Reply