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Instruments might be useful for the purpose of navigating through the air, or for external interests such as collecting meteorological data.

Recording thermometer illustrated in 1898
"Universal meteograph" comprising themometer, barometer, and psychrometer.

Many instruments at the turn of the century can be obtained as appareils enregistreurs (i.e., recording apparatuses) with interior compartments in which a needle continuously imprints the data on a scroll.[1]

Enclosing categories Simple tech terms
Subcategories Compass, Barometer, accelerometer, Thermometer, psychrometer
Keywords Navigation, Photography, Meteorology
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Patents in categories Instrument or Instrument