Rare and fascinating 18th century english brass universal equinoctial ring dial.

Rare and fascinating 18th century english brass universal equinoctial ring dial.

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Country of manufacture

UK and Ireland

Categories: Scientific, Portable Sundials, Timekeeping

Description

Rare and fascinating 18th century english brass universal equinoctial ring dial.

(Unsigned)

The outer meridian ring with two quadrants divided into degrees annotated 0-90 in two directions to one side opposing engraved quadrant of degrees for altitude also annotated 0-90.

The pivoted inner ring is engraved with Roman numeral chapter ring annotated I-XII twice divided into five minute intervals.

The rotating bridge with central slot fitted with pinhole slider engraved with a zodiacal scale with corresponding signs over declination scale in degrees opposing calendar to other side, the outer rim with adjustable bracket fitted with suspension ring.

diameter 10cm (4ins);

 

Some historical news

This kind of ring dials is associated with the name of one important Dutch  mathematician, cartographer, philosopher, and instruments maker.

Gemma Frisius combined several of the instruments into a small, portable, astronomical-ring instrument. He first published the design in 1534.

He created important globes, improved the mathematical instruments of his day and applied mathematics in new ways to surveying and navigation.

 

Feel free to ask for any further photos and informations.

 Thanks

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IT Eppursimuove

Eppursimuove

Eppursimuove is located in the northwest of Italy. I deal with antique scientific instruments and their history. This passion has turned into a profession that leads me every day in search of ancient instruments that helped us to observe, measure, explore and know the sky and the earth. They still amaze and make us wonder, as they did for their original makers and users. For this reason they must be preserved and collected. Please feel free contact me if you need more information on listed items. Thanks.