Scarce Pocket Barograph - Barometer by Jules Richard No 824 c.1910. ventes exceptionnelles

scarce barometer - Barograph Jules richard.

Scarce Pocket Barograph - Barometer by Jules Richard No 824 c.1910.

A scarce pocket recording barograph No 824, Type F to 7,000 feet, by Jules Richard, Paris for the English market.

Antique pocket barograph constructed in brass and steel with nickel-plated parts, having twin chart transport rollers, the outer roller with detensioning lever enabling the easy loading and removal of charts.

The well-engineered mechanism comprising a clockwork motor and barometer driven by twin 35mm diameter capsules tensioned on a coil spring with axial calibration screw, the signal transmitted through a rocking shaft with counter-balance to a counter-balanced recording arm set on vertically opposed pivots with base-mounted hair spring, spring bias adjustment on a square.

The clockwork mechanism set between polished steel plates with platform balance and going barrel driving geared reduction train with power to chart transport rollers, causing one complete chart rotation every six hours, and recording arm control having rising and falling gate causing inked chart mark on a 30 second cycle.

The nickel-plated mechanism cover with the “Jr” monogram of Jules Richard, “Made in France,” and “Brevette, Sgdg,” and having three control points: the first, marked “1,” a three-position slide control with “A” denoting normal service or operating position, “B” the arrested position with the arm away from the paper to allow changing of the recording chart, and an arrow indicating the mid-position which allows free and unrestricted movement of recording arm as required for calibration; the second, marked “2,” the calibration square; the third, “3,” the clockwork regulation control. The lower left struck with instrument serial no “824” and “6H,” denoting a six-hour chart cycle.

Maintained to the chassis on twin slotted blued ventes exceptionnelles round nuts.

It's in working condition at least the clock mechanism is working