Скачать или смотреть Cloud Base Height

‪@Samwel731‬ The height of the base of a cloud may be measured by a cloud searchlight. A vertically directed searchlight produces a spot of light on the base of the cloud. An alidade is used to measure an angle of elevation E from a point at a known horizontal distance L. The site of the searchlight is chosen such that the length of the baseline L is 1000 feet to ensure that the entire beam is visible from the alidade. The searchlight is installed so that the beam is vertical. The instrument can only be used at night. The height of the cloud base is equal to horizontal distance L multiplied by the tangent of the angle of elevation E.
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