Magnetic observations at Valencia, May 29, 1919

A temporary declinometer was erected in the basement of the Valencia Observatory at Cahirciveen, Ireland, and readings were taken from it every minute from 9 h 58 m to 16 h 50 m , G. M. T., May 29, 1919. [Table 1 contains the five‐minute means derived from these observations.] The chronometer used is regularly verified several times per week by a direct time signal from Greenwich, and by allowing for the error at the time, the readings of the declinometer were taken at each exact minute G. M. T. It is not at likely that there was any systematic error greater than ±2 s.