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Bluestone – Brequet

Bluestone

A soft blue stone, sometimes used for reducing brass and gold before polishing. It must not be confounded with blue vitriol, sometimes called bluestone.

Bluing

The changing of the color of steel by heat.

Bow Tightener

See Pendant Bow Tightener.

Bow Pen

A metallic ruling pen, similar to the one attached to the bow compasses.

Breguet Spring

See Hair Spring.

Bridge

The standard secured to the plate, by means of screws, and in which a pivot works.

Bronzing

See Electro-Plating, Bronzing and Staining.

Bullseye

A thick watch resembling a bull's eye in shape. A term usually applied to old fashioned English verge watches.

Bush

A perforated piece of metal let into a plate to receive the wear of pivots. See Bouchon.

Boston Watch Company

In 1854 the location of the factory was changed to

Brequet

He was the maker of a number of excellent astronomical clocks for Swiss, German and Russian observatories. He died in 1849.