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While still in limited use today, tuning capacitors were far more common in radio transmitters and receivers from prior years. The capacitor, coupled with an inductor (coil) form a resonant "L/C" circuit. The resonant frequency depends on the value of the inductor and capacitor.
Rotating the knob to have more of the plate area overlapping gives a higher capacitance while rotating it to have less overlap yields a lower capacitance.
This allows the user to change the resonant frequency of the circuit and thereby tune to different stations in a radio receiver or adjust the output frequency on a transmitter.
The straight edge of a plate in this capacitor is approximately 1.5".
Variable Oystercatcher at Omaha Beach.
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©2018 Fantommst
It's hard to really see, but I think this is the remains of a logging road in a forest near my house. Got out to play in the fog.
Encontro (Icterus pyrrhopterus).
(Vieillot, 1819)
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When I first saw this tiny butterfly in Sweden my initial thoughts were that it was a Small Blue (Cupido minimus) but its upperside had too much blue, and that underside hindwing had almost no spots. I then realised it was a Green-underside Blue (Glaucopsyche alexis) which is in the same genus as Large Blue (Glaucopsyche arion). But this really was a small butterfly, only marginally larger than a Small Blue. The name Green -underside comes from a flush of green at the base of the underside hindwings but this feature is variable and it isn't really visible here. Another characteristic of Scandinavian butterflies is the paucity of hindwing spots, which are usually more extensive further south in Europe. Its caterpillars feed on various vetches (members of the pea family) and it is found throughout much of Europe including southern Scandinavia. There is a single puzzling record from Torquay in Devon in September 1936. I say puzzling because this butterfly is not known to migrate and it only has one spring/summer emergence between April and July.
The Variable Hawk is one of the most commonly seen birds of prey in Patagonia, but you might not know it. As its name suggests, it appears in a bewildering multitude of different morphs - the species is described as "polymorphic" that differ from each other to an extent that many argue that they should be considered different species.