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A spherometer is an instrument used for the precise measurement of the radius of curvature of a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens .
A Christmas card depicts the ideal of a white Christmas. A white Christmas in Trondheim. A white Christmas is a Christmas with the presence of snow, [1] either on Christmas Eve or on Christmas Day, depending on local tradition. The phenomenon is most common in the northern countries of the Northern Hemisphere.
Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.
Another snow sensor called a snow pillow looks like a round bag lying on the ground. Inside the pillow is a liquid such as an environmentally safe [citation needed] antifreeze. Usually the snow pillow will be connected to a manometer. The manometer reading will vary based on how much snow is sitting on the pillow.
During the Early Northern Renaissance and even more during Dutch Golden Age painting in the 17th century, interest in landscape painting was increasing. The winter of 1564–1565 was said to be the longest and most severe for more than a hundred years – the beginning of a cold period in northern Europe now called the Little Ice Age.
A Christmas Snow is a 2010 direct-to-video independent Christmas film by Trost Moving Pictures. It stars Catherine Mary Stewart, Muse Watson, Anthony Tyler Quinn and newcomer Cameron ten Napel. [1] There is also a guest appearance by Danny Cahill as the Food Critic.
Non-free Christmas images (17 F) Media in category "Christmas images" ... Father Christmas cartoon, Punch magazine, 24 December 1919.jpg 1,300 × 786; 522 KB.
Simon Beck (born 1958) is a British snow artist and a former cartographer. Referred to as the world's first snow artist, he is primarily known for his landscape drawings and sculptures created from snow and sand. His work appeared in new media after he completed installations at Banff National Park in Alberta and Powder Mountain, Utah.