Two types of electric recording cup anemometer employing the Sheppard three-cup rotor are described, the instruments being suitable for applications where results of high accuracy are desired and for the measurement of light winds, the stopping speeds of the anemometers being as low as 0.15 m./sec. (30 ft./min.). High sensitivity and constancy of calibration is achieved by minimizing the bearing friction and the torque necessary to operate the impulsing device. A source of heat in the anemometer body is found to be very effective in preventing bearing corrosion and consequent changes of friction. In the first type of anemometer a photoelectric impulsing system is employed, while the second arrangement (the `micro-contact anemometer') uses a very light electric contact in conjunction with a thermionic valve. Photographic recording of the electric counters on bromide paper is found to be the most convenient recording system. Both types of anemometer have functioned satisfactorily during considerable periods of exposure to the British climate.