Rain gauge with improved syphon discharge

摘要

An improved rain gauge in which a large rain collector feeds collected rain into a receptacle having 1/5 the cross-sectional area, and in which a float and counterweight connected by a flexible strand passing over a pulley mechanism creates electrical impulses with each 1/100 inch of rainfall added to the receptacle, and in which the receptacle is periodically emptied by a syphon device of generally U-shaped contour providing intake leg and discharge leg, wherein complete emptying of the syphon tube is facilitated by incorporating within the discharge leg thereof a small diameter tube closed at the top end, open at the bottom end, and having a plurality of small holes spaced longitudinally thereof, whereby air entering the small tube and passing through the longitudinally spaced holes therein, serves to equalize air pressure and permit the full discharge of liquid from the syphon tube.