Some meteorological instruments used in building research

The paper describes four electrically operated meteorological instruments, traces the reasons for their development and gives some examples of the uses to which they are put. The first instrument¿a wind-run analyser¿records the run of wind over successive time intervals which may be varied from five minutes to one hour. The wind-direction recorder shows, on meters, the run of wind over any desired period, from each of eight directions. The third instrument, an equivalent-air-temperature recorder, measures the equivalent temperature to which walls of various orientations are exposed, taking into account air temperature, radiation and air movement. Finally, the paper describes a temperature integrating and averaging device, from which the mean temperatures of the preceding period may be read directly.