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A round, white Botts' dot, surrounded by excess adhesive Botts' dots on Interstate 280, near the Sand Hill Road exit, Menlo Park, California. Botts' dots (turtles in Washington and Oregon or buttons in Texas and other southern states) are round non-reflective ceramic [1] raised pavement markers.
The marker is generally held in place using butyl pads, epoxy glue, or bitumen. [2] In areas with little snowfall, reflective raised pavement markers are applied directly on top of the road surface. The device's retroreflective surface enables the device to be clearly visible at long distances at night and in rainy weather.
For the 2-inch mirror reflector. Reflector—custom speculum metal composition; Optical mirror diameter— 2 inches (50 mm) Optical stopped down aperture— 1.3 inches (33 mm) Optical focal length—6.25 inches (158 mm) Optical effective (stopped down) F-number—f/4.78; Optical bare mirror F-number—f/3.16
In 1900 a 1-meter reflector would be among the largest in the world, but by 2000, would be relatively common for professional observatories. ... Harvard 60-inch ...
Yapp 36 Inch reflector; Thompson 30 inch reflector; Thompson 26 inch reflector; Markree Observatory 13.3" Cauchoix (the largest refractor of the early 1830s) A.A. Commons reflectors (later reworked into Crossley and Harvard telescopes) Lassel's reflector, this 24 inch metal mirror telescope was used to discover the moons Triton and Hyperion ...
Dec. 30—As 2022 comes closer day-by-day, people across Abilene are looking back on 2021. The Reflector-Chronicle is doing the same by looking back on the stories that received the most attention ...
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