The most expeditious method of determining altitudes ... with the ... barometer ; together with a description of the instrument, examples of its use ... To which is added a short description and use of T. Jones's patent sectograph / [Sir Henry Englefield].

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The most expeditious method of determining altitudes ... with the ... barometer ; together with a description of the instrument, examples of its use ... To which is added a short description and use of T. Jones's patent sectograph / [Sir Henry Englefield]. Public Domain Mark. Source: Wellcome Collection.