L.- mercurial barometer. R. - sling psychrometer.In: The Aims and Methods of Meteorological Work by Cleveland Abbe. In: Maryland Weather Service, Johns Hopkins Press, Baltimore, 1899. Volume I. Page 306.
10/23/2018 10:10:31 AM
Photographer: Archival Photograph by Mr. Sean Linehan
Affiliation: NOS
Subject: Instruments
Subject: Measurement