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Negretti and Zambra, Holborn Viaduct, London.

Standard Meteorological Instruments.

Standard " Fortin ” Barometer, with tube ‘6 in. internal diameter, with square frame and square cistern.

Standard Barometer, as originally designed by Newman; of strong construction, with an iron cistern in order to support the great weight of mercury, and yet on the " Fortin ” principle, with tube ’6 in. internal diameter.

Standard Thermometer, of the highest accuracy.

Standard Thermometer, mounted with opal scale; oak frame.

Standard Thermometer, " Reference" type, as used by the Meteorological Office, for use in H.M. Navy, &c.

Standard Maximum Thermometer, Negretti and Zambra's original patent.

Standard Minimum Thermometer, to match the above.

Terrestrial Radiation Thermometer, with special sensitive bulb in the shape of a link.

Solar Radiation Thermometer, with blackened bulb in vacuum sheath, with a new type of gauge for indicating the state of the vacuum.

Negretti and Zambra's Mercurial Minimum Thermometer.

Standard Hygrometer, with wet and dry bulb thermometers.

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