LOT 52 A rare English simple altitude ring or 'poke' portable sundial, unsigned, circa 1700
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A rare English simple altitude ring or 'poke' portable sundial Unsigned, circa 1700 Formed as a ring 1.5 inches in diameter fitted with moveable central band pierced with a pin-hole over slit cut within the body of the ring for about 120 degrees beneath sliding against a scale stamped with letters denoting months of the year I-I (for January to June) in one direction and I-D (for July to December) in the other, the interior with opposing scale stamped 4 to 12 then back from 12 to 8 And with divisions for approximately every ten minutes, the top with simple arched suspension loop. The current lot is designed to be used for a single location (ie. for a fixed latitude) and would be operated by first setting the pin hole for the approximate date and then suspending the dial with the hole facing the sun to allow the light projecting through it to fall onto the scale to the inside of the ring behind to provide the time of day. Naturally the user would need to know whether it is morning and afternoon (can be ascertained by taking a few readings to see if the sun is rising or falling) and the accuracy will be very limited. This type of dial is described in Cowham, Mike A DIAL IN YOUR POKE on pages 21-23 where it is suggested that they were mostly made in England and probably date to around 1700.
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Donnington Priory Newbury Berkshire RG14 2JE United Kingdom
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