£280
Good light oak cased barograph, the brass bed plate signed Callaghan & Co., 23a New Bond St., London W., within a bevelled glazed case over a stepped base fitted with a chart drawer, 14.75"
** This barograph has an eight day movement and eight linked Vidi bellows, a similar barograph is illustrated in Barometers: Aneroid and Barographs by Edwin Banfield, page 115, fig. 101
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