Mechanischer verbesserter Wind-Regen-und Trockenheitsbeobachter

Freyburg & Annaberg: Craz, 1789. First Edition.. contemp. marbled wrappers.. A very good copy; small, inoffensive 19th cent. lib. stamp on the title.. 8vo. There are 4 numbered plates on two sheets illus. the devices.

This pamphlet is a description of an elaborate an innovative automatic recording device for rain, wind direction and humidity. Each of the measurement systems devised by Herrmann were clock driven and appear to be the refinement of a similar system designed by Leupold in 1726. Herrmann's genius, however, is revealed in his design for the wind recorder. This device consisted of a wheel with 12 sector shaped compartments. Once and hour a clock driven hammer ejected a numbered cube from a magazine into the appropriate sector. After a fixed time cycle the observer would have a clear record of changing wind conditions. See Middleton, Meteor. Instruments, pp. 136, 179-'80.