Barograph having finely executed lacquered brass mechanism, raised on four turned pillars over a half-plate bevelled chassis, comprising seven pressure sensing capsule stack with calibration knob over, burnished and blued pivots, blued screws, polished recording arm, arrestor bar, ink station with later bottle and dipper. Drum with fully enclosed conventional eight-day movement having platform escapement, captive winding key, time adjustment port, sprung paper retainer with rotating securing clip, lid, securing knurled nut. The sun wheel struck no. “12,” polished steel axis shaft. The base with ivorene plate marked “Negretti & Zambra, London,” frieze chart draw below. Five bevelled glass case over with timber frame, the whole raised upon slab feet.
Produced at a time when Negretti & Zambra were arguably at the height of their game, this is unquestionably quality. Hitherto Negretti & Zambra had imported and sold barographs made by Richard Frères, France but badged as “Negretti & Zambra.” They also bought and re-sold instruments manufactured by Short & Mason. Genuine Negretti & Zambra barographs may be considered scarce, and this pattern resembles the much more common Short & Mason instrument.
The subject of a complete re-build, with attention having been paid to alignment, balance and pivots. Now exhibiting very good sensitivity and progression. The arm manufactured and replaced by us, the brass work remains original in all respects. The case disassembled and re-lacquered.
The chart shown was recorded by this instrument as a test at an elevation of 600ft (unadjusted).
Dimensions: 14” wide x 8 ½” high x 8 ½” deep
Stock No: BG0506