Abstract: A lightning resistant hydrological pulley comprising an insulator between a pulley body and an axle insert. The insulator is made of electrically non-conductive material, thereby denying lightning surges an electrical path from the pulley body to an axle disposed within the axle insert. Set screws angularly immobilize the pulley body relative to the insulator, and the insulator relative to the axle insert and relative to an axle disposed within the axle insert. In the preferred embodiment, the insulator is made of synthetic material such as white Delrin, and the pulley body and the axle insert are made of brass.

Abstract: A rain gauge and methods of tilt time calibration and flow rate calibration. The rain gauge comprises a pair of buckets separated by a darn rotatably attached to a base. A threaded balance weight is used to calibrate the rain gauge to equalize the tilt times of the buckets. A pendulum weight turns on a threaded stud attached to a frame is used to calibrate the rain gauge for different flow rates of water reflecting rainfall intensities from 2 in/hr to 12 in/hr. The buckets' outflow is directed into graduated cylinders, which may also be used during calibration. A pair of uprights support a funnel platform having a funnel platform aperture. The funnel platform aperture is sized to precisely hold a funnel in position relative to the bucket assembly, thereby permitting different buckets to be used without having to re-calibrate the rain gauge. A cover having at least one cover aperture is provided which permits visually checking the operation of the rain gauge without having to remove the cover.