Anemometer
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The instrument measures total run of wind passing at the point of observation through mechanical counter of the range 0 to 9999.9 km. The counter is housed in a metallic box with a window to observed digits. A steel spindle carries the cup assembly and drives the lay shaft by worm and wheel, the worm is pinned onto the spindle. The unit can be calibrated to read kmhr depending on the worm-wheel configuration. the bearings are self lubricating and therefore no maintenance required. The spindle is protected by a cone from the top from precipitation.