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The Landis Valley Village & Farm Museum is a 100-acre living history museum located on the site of a former rural crossroads village in Lancaster, Pennsylvania. Founded by brothers Henry K. Landis and George Landis in 1925 and incorporated in 1941, it is now operated by the Pennsylvania Historical and Museum Commission . [ 3 ]
A study in 1981 estimated that the dose from using a thorium mantle every weekend for a year would be 3–6 microsieverts (0.3–0.6 mrem), tiny in comparison to the normal annual background radiation dose of around 2.4 mSv (240 mrem), although this assumes the thorium remains intact rather than airborne. A person actually ingesting a mantle ...
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The slide images were too small for unaided viewing, and required enlargement by a projector or enlarging viewer. Photographic film slides and projectors have been replaced by image files on digital storage media shown on a projection screen by using a video projector , or displayed on a large-screen video monitor .
A garden solar lamp A child in Zambia studying by the light of a lamp charged by solar power during the day. A solar lamp, also known as a solar light or solar lantern, is a lighting system composed of an LED lamp, solar panels, battery, charge controller and there may also be an inverter.
These lamps have handles, short, plain nozzles, and less artistic finishing. Frog This is a regional style lamp exclusively produced in Egypt and found in the regions around it, between c. 100 and 300 AD. The frog is an Egyptian fertility symbol. African Red Slip Lamps made in North Africa, but widely exported, decorated in a red slip.
Lava lamps An original Mathmos Astro lava lamp A lava lamp is a decorative lamp , invented in 1963 by British entrepreneur Edward Craven Walker , the founder of the lighting company Mathmos . It consists of a bolus of a special coloured wax mixture inside a glass vessel, the remainder of which contains clear or translucent liquid.
A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Two varieties of such lamps exist: low pressure, and high pressure.