stone plaque · London
Sir Francis Ronalds FRS

This stone plaque commemorates Sir Francis Ronalds, a distinguished English scientist and inventor, particularly noting his pioneering work in electrical communication. Ronalds is recognised for his significant contribution to the field through the creation of what is arguably the first functional electric telegraph spanning a considerable distance. His inventive spirit also led to the development of the earliest electric clock. The plaque serves to highlight the specific site where a pivotal experiment in telegraphy took place, marking it as a location of historical importance in the advancement of electrical engineering.
The memorial to Sir Francis Ronalds dates from an era of profound scientific and technological change, a period that laid the groundwork for modern telecommunications. Ronalds's experiments in electric telegraphy in the early 19th century predated the widespread adoption of such systems but were crucial in demonstrating their feasibility. His work contributed to the burgeoning understanding of electricity and its practical applications during a time when rapid communication across distances was a pressing challenge. This plaque, therefore, connects to a wider narrative of innovation and the pursuit of scientific discovery that characterised the 19th century.
The plaque dedicated to Sir Francis Ronalds is located at the Coach House, 26 Upper Mall, which can be found in London, W6. Visitors will see a stone plaque affixed to the building, marking the historic site. This address is situated in an accessible part of London, allowing the public to easily visit and reflect upon Ronalds's contributions to science and engineering. Observing the plaque offers an opportunity to connect with a specific moment in the history of technological innovation, set within the urban landscape of London.
Inscription
“The first electric telegraph 8 miles long was constructed here in 1816 by Sir Francis Ronalds FRS”
Background
Sir Francis Ronalds is remembered for his pioneering work in science and invention. He is credited with designing the first functioning electric telegraph system capable of transmitting signals across a considerable distance. Ronalds also developed the earliest electric clock.
His significant achievements were recognised with a knighthood. An early demonstration of his electrical telegraph involved an eight-mile circuit of iron wire erected in 1816, using electrostatic generators to send signals.
Original summary by TributeLegacy, informed by public sources.
Source: Open Plaques. Geographic data via OpenStreetMap.
