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<th lang="en">Picture of the day
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<td class="toccolours" style="padding:0"><span><a href="Photoelasticity_-_TDK_Head_Cleaner_-_White_background.jpg" class="mw-file-description"><img src="http://unitedyam.com/wp-content/uploads/2025/09/picture-of-the-daytdk-tape-head-cleaner-cassette-hcl-11-made-of-clear-hard-plastic-the-plastic-is-birefringent-and-demonstrates-internal-stress-as-coloured-patterns-photoelasticity-when-p.jpg" width="300" height="200" class="mw-file-element" data-file-width="5542" data-file-height="3690"></a></span>
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<td><div lang="en" dir="ltr" class="description en">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.</div>
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#Image, #Art
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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.
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Source: https://commons.wikimedia.org/wiki/Special:FeedItem/potd/20250828000000/en
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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.
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