#Posy #video about graphical equalizers on audio equipment with frequency-sweep measurements
on 02025-10-18#Posy #video about Cokin’s red polarizing filters for #photography, which only polarize red light, so that once you set the white balance you get rainbows from #polarization gradients. Except the rainbows he got were mostly from a regular polarizing filter and strained plastic (polycarbonate? acrylic? from a CD case) with wavelength-dependent birefringence.
on 02025-10-15#Posy’s 7-segment displays alternative #video, including the Kinsley patent from 01915 (US 1,126,641).
on 02025-08-12#Posy #video on household objects under high magnification
on 02024-11-11#Posy #video on iridescent colors from hot water and steam
on 02024-11-11#video by #Posy on his “lazy” channel.
on 02024-11-03#Posy on Dutch fireworks regulation #video
on 02024-04-03