Product images of Dipleidoscope
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Manufactured in the UK
All products are printed in the UK, using the latest digital presses and a giclée printmaking process.
We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.
Dipleidoscope dial for latitude 52 north. It has a square base set on three small feet, one of which is also a levelling screw. A rusty steel compass needle is set in a glazed rectangular box along one edge. The needle can be locked in position by an arm operated by a lever on the side of the box. This box has a degree scale at one end, divided anticlockwise -. The fact that 20 is in the middle might suggest that this was the magnetic variation at the time of production. There is also a bubble level on the base.
The semicircular hour arc is inclined at an angle to the base. It is numbered clockwise IX-XII, I-III. An inclined brass pillar set at the centre of the hour arc supports the prism and mirror attachment and can be turned and locked in position. The attachment consists of a squat cylinder, in the upper face of which is a blue glass aperture behind which are set two mirrors. The number '1577' is scratched on the underside of the base; this is probably the serial number of the instrument. Such a serial number suggests that it was made in the 1850s.
Edward John Dent & Co.
- Image reference: F3431
- National Maritime Museum, Greenwich, London