A shape defined by its function: this enclosure is meant to hold a temperature sensor. The openings allow maximum air convection for an accurate reading. Via Ambient Weather.
A device for teaching fractions to the visually impaired, from the 1910 book “Der Blindenunterricht. Vorträge über Wesen, Methode und Ziel des Unterrichtes in der Blindenschule”, via Bitcraft Lab.
Images of the LUX Dark Matter Detector, a device for detecting the presence of dark matter. Based in the Black Hills of South Dakota, the detector is suspended in a large stainless steel tank (seen above) that is filled with 70,000 gallons of water to protect the detector from outside radiation. The sensors themselves (bottom image) are lined with white Teflon.
A sutured wound, seen under magnification and (I believe) colored later (via Danoah)
Blimp dock, from sometime in the 1920s (via Library of Congress, via Core77)
Lightbulb filament welder (via “How Its Made”; season 7, episode 9).