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Barometer Clock (Boulle) by André-Charles Boulle is a late seventeenth-century French clock created out of ebony, turtle shell, brass, gilt bronze, and enamel. The clock case is decorated on all sides and was intended as either a centerpiece or for display on a mantel in front of a mirror. [ 1 ]
The surveyor's wheel is marked in fractional increments of revolution from a reference position. Thus its current position can be represented as a fraction of a revolution from this reference. If the wheel rotated a full turn (360 angular degrees), the distance traveled would be equal to the circumference of the wheel. Otherwise, the distance ...
The changing height of the mercury in the barometer was recorded on a continuously moving photosensitive surface. [5] By 1847, a sophisticated temperature-compensation mechanism was also employed. Ronalds’ barograph was utilised by the UK Meteorological Office for many years to assist in weather forecasting and the machines were supplied to ...
A wheel barometer uses a "J" tube sealed at the top of the longer limb. The shorter limb is open to the atmosphere, and floating on top of the mercury there is a small glass float. A fine silken thread is attached to the float which passes up over a wheel and then back down to a counterweight (usually protected in another tube).
The detent is a detached escapement; it allows the balance wheel to swing undisturbed during most of its cycle, except the brief impulse period, which is only given once per cycle (every other swing). [44] Because the driving escape wheel tooth moves almost parallel to the pallet, the escapement has little friction and does not need oiling.
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The Poplar Grove Vintage Wings and Wheels Museum is an interactive museum of technology and history at Poplar Grove Airport located south of Poplar Grove, Illinois. The museum contains a number of historic hangar buildings filled with artifacts and exhibits which document aircraft, air crews and the history of powered flight.
The Zambretti Forecaster is a weather forecasting instrument used in conjunction with a barometer. It interprets the reading of a barometer into one forecast from a large selection of permutations after making allowances for variable factors. These include wind direction, a rising, falling or steady barometer, and the season. [1]
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