Cushion : The Plan Position Indicator System by G. H. Davis
Home Decor from Mary Evans Picture Library
The Plan Position Indicator System by G. H. Davis
A diagram showing the system developed as part of British radar sets, first demonstrated in the Thames Estuary. The system gives a picture of obstructions in the vicinity, allowing movement in low-visibility conditions.
1946
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Media ID 14125309
© Illustrated London News Ltd/Mary Evans
Conditions Davis Diagram Indicator Movement Navigation Plan Position Radar Shipping System Visibility Obstructions
Cushion
Refresh your home decor with a beautiful full photo 16"x16" (40x40cm) cushion, complete with cushion pad insert. Printed on both sides and made from 100% polyester with a zipper on the bottom back edge of the cushion cover. Care Instructions: Warm machine wash, do not bleach, do not tumble dry. Warm iron inside out. Do not dry clean.
Accessorise your space with decorative, soft cushions
Estimated Product Size is 40cm x 40cm (15.7" x 15.7")
These are individually made so all sizes are approximate
Artwork printed orientated as per the preview above, with landscape (horizontal) or portrait (vertical) orientation to match the source image.
EDITORS COMMENTS
This diagram represents The Plan Position Indicator System, a groundbreaking innovation developed by G. H. Davis in 1946 as part of British radar technology. The system revolutionized navigation in low-visibility conditions, particularly in the Thames Estuary, where shipping traffic was dense and the foggy weather often posed significant risks. The Plan Position Indicator System, or PPI for short, provided mariners with a real-time picture of obstructions in the vicinity, enabling them to make informed decisions about the movement of their ships. The system worked by emitting radio waves that bounced off nearby objects and returned to the radar set, creating a two-dimensional representation of the surrounding environment. The PPI system was a significant advancement in radar technology, as it allowed for the detection and location of multiple targets simultaneously. This was particularly useful in busy shipping lanes, where the risk of collisions was high. The system also enabled mariners to navigate more effectively in poor visibility conditions, such as fog or heavy rain, which were common in the Thames Estuary. The diagram illustrates the various components of the PPI system, including the radar antenna, the cathode ray tube display, and the various control mechanisms. The system was a crucial tool for ensuring the safety of shipping traffic in the Thames Estuary and other areas with similar navigational challenges. Today, radar technology has advanced significantly, but the principles of the PPI system remain an essential part of maritime navigation.
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