Content of: Picture of the Day 08/28/25 - Wikimedia Commons
•
08/28/25 at 07:16AM
•
Photography
•
See more by Photogems
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.
Colin, CC BY-SA 4.0, via Wikimedia Commons. View source.
