Early 20th Century Mahogany Barothermograph – SOLD
Antique barothermograph having combined movement with seven capsule pressure sensor, adjustment wheel over, polished steel cross shafts. Helical bi-metallic thermo sensor with adjustment wheel, swinging gate recording arms. All raised on turned columns over a short chassis with fluted border. Twin ink stations with correct bottles and dippers. The type R8D- 7 day recording drum by Gluck Engineering, captive winding key and top cover.
The mahogany base with frieze drawer and on full width slab feet. The lift off cover with five bevelled glasses, end glass with atmosphere transfer port.
Condition: The subject of a comprehensive re-build, conservation, and limited restoration. Set up and calibrated under laboratory conditions.
Generally very crisp and original, some wear to the lacquered finish to the front of the plinth, minor losses and marks. The drum top plate with some oxidation. Both arms replaced with bespoke Vavasseur parts, two replacement nibs. The barothermograph movement disassembled, re-aligned and re-balanced, all pivots re-faced and polished. The barograph tested and calibrated under laboratory conditions.
Comments: These instruments are now rarely seen. Short & Mason, prolific in the making of barographs, produced amongst the very best domestic instruments, and this particular model benefits enormously from the swinging gate recording arms, a system that ensured consistent nib setting across the curvature of the drum. The system also allowed for any run-out in the rotational axis of the drum. This characteristic, allied with the provision of a Gluck-made drum, all speak for a superior quality instrument.
A very good working instrument showing good sensitivity. For the collector and user alike.
Dimensions: 14½” wide x 9″ high x 9″ deep
Stock No: BG1701