A DIPLEIDOSCOPE BY E.J. DENT, CIRCA 1850
heavily constructed in brass, engraved 'EAST' to right of base, and impressed on prism E.J. Dent / Patentee / 1343, the lid inscribed F. DENT'S / Patent / Meridian Instrument / 61 Strand / & 34 & 35 Royal Exchange / LONDON and scratch numbered inside '701' -- 3.1/8in. (8cm.) high

The dipleidoscope was patented in 1843 by James Bloxam and marketed by Edward Dent for timing the meridian transit of the sun. The mirror cell contains a hollow, right-angled prism, with two sides silvered and one of glass. The meridian transit was determined by the coincidence of two images of the sun by single and double reflection, one from the top glass and the other from both mirrors. With the base properly levelled and orientated, the meridian transit could be read to seconds. Presumably inscribing this lid 'F. Dent' is an engraver's error.

Condition Report
In fine overall condition.

We are pleased to provide you with a general report of the condition of this property. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Charles Miller Ltd is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue. NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD “AS IS” IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE.