This is an English barograph which employs a pair of large diaphragms to generate the pressure changes on to the recording chart. These movements were produced as more economical alternative to the standard type which normally has a stack of seven or eight smaller diameter diaphragms, however, they produce the same trend in pressure recording. This instrument is unusual as it has a chart drawer to the base of this very stylish Mahogany case. 220mm H x 367mm W x 245mm D
6 months' supply of charts and a fresh bottle of ink included.