Crescent sundial

Crescent sundial

A modified form of universal-ring dial in which the ring is divided into two equal semicircular portions placed back to back. The division is made at the '12' marks, so that the semicircles face due east and west respectively when correctly set. The pinhole is replaced by the tip of a curved gnomon, which slides on a date scale.

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Part of Speech: noun
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Industry/Domain: Chronometry
Category: Clock
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Related terms

crescent sundial

Chronometry; Clock

A modified form of universal-ring dial in which the ring is divided into two equal semicircular portions placed back to back. The division is made at the '12' marks, so that the ...

sundial

Garden; Outdoor decorations

A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style onto a surface marked ...

sundial

Science; General science

An instrument for telling time by the Sun. It is composed of a style that casts a shadow and a dial plate, which is the surface upon which hour lines are marked and upon which the ...

sundial

Garden; Gardening

A Sundial is a device which uses the sun to tell the time, much-used as a garden ornament.

sundial

Language; Dictionaries

An instrument to show the time of day by means of the shadow of a gnomon, or style, on a plate.

reverse painting

Chronometry; Clock

A picture or design often used on a clock tablet and painted on the back side of a glass in reverse order of a normal painting.

reverse fusee

Chronometry; Clock

The reaction of engagement of the great wheel with its pinion is transmitted to its pivot and, in the usual layout, the pull of the fusee line adds to this load. In the ...

rete

Chronometry; Clock

The rotatable circular star map of an astrolabe, in the form of a network of pierced and engraved metal.

frosting

Chronometry; Clock

The granular or matted finish given to the surface of brass clock parts prior to gilding. It is produced by dipping the parts briefly into a concentrated mixture of nitric and ...

front wind

Chronometry; Clock

A clock that is wound through an opening in the dial.

free pendulum

Chronometry; Clock

It has been known for a long time that a 'free' pendulum clock will achieve perfect timekeeping. A pendulum, to achieve this, would maintain its arc and do no work, without ever ...