Rensselaer Semi-Weekly Republican, Volume 34, Number 11, Rensselaer, Jasper County, 8 October 1901 — The Height of Clouds. [ARTICLE]

The Height of Clouds.

To determine the height of clouds an observer at each of two stations a mile or more apart measures the angle and altitude of some point of a cloud, the Identity of which Is ascertained from conversation by telephone, while synchronism in the observation Is secured by the beating of electric pendulums. This is the method used at the celebrated observatories at Upsala, in Sweden.