,000 registering instruments, of which the majority were
probably thermographs and barographs. At that time, certainly no other
maker had made more than a small fraction of this number of
self-registering instruments. The origin of Richard's thermograph seems
to have been the "elastic manometer" described by E. Bourdon in 1851
(_Bulletin de la Societe d'Encouragement pour l'Industrie Nationale_,
1851, no. 562, p. 197). While attempting to restore a flattened
still-pipe, Bourdon had discovered the property of tubes to change shape
under fluid pressure. The instrument he developed in consequence became
the standard steam pressure gauge.

[34] A few of these instruments, such as the Marvin barograph, survived
for some time because of their superior accuracy. Even as museum pieces,
only a few exist today.

U.S. GOVERNMENT PRINTING OFFICE, 1961.

For sale by the Superintendent of Documents, U.S. Government Printing
Office, Washington 25, D.C. - Price 25 cents

Transcriber's Note:

Minor errors in punctuation have been corrected without note. The
following typographical errors in the original have been corrected:

P. 110: 'a panopoly of gadgetry': corrected to panoply
P. 113, caption to Figure 13: 'Feuss': corrected to Fuess
Footnote 28: 'Gewerbeaustellung': corrected to Gewerbeausstellung
Footnote 28: 'Physikalisches Worterbuch': corrected to Woerterbuch
Footnote 29: 'see also Gerland and Trauemuller': corrected to Traumueller

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Meteorological Instruments, by Robert P. Multhauf

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