World War I Early Warning Acoustic Mirror 60m East of Boulby Barns Farm

North Yorkshire

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Rear view of Sound Mirror
Side view of Sound Mirror
Long distance front view of sound mirror
Front view of sound mirror taken with Zoom Lens
Boulby Sound Mirror Revisited
Boulby Sound Mirror Revisited
Boulby Sound Mirror Revisited

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Data Source

English Heritage

County Council (Unitary)

Redcar and Cleveland Borough Council



Parliamentary Constituency

Middlesbrough South and East Cleveland

Grid Reference

SE754754 (475363, 519113)

WGS84 Coordinates

54.5615, -0.83441

Nearest Postcode

TS13 4UT

The nearest postcode is an aid to location, and does not necessarily reflect the actual address of the monument. Most scheduled monuments are not occupied buildings and have no postal address or postcode of their own. In rural and coastal areas, the nearest geocodable postal address may be several miles away.

User-Submitted Notes

Due to the threat of attack by Zeppelins this sound mirror was erected in 1916 along with two others along the North East Coast, one of which is now in a Redcar Housing Estate and is listed on this website, the other I have no idea where it was. On their own they could indicate the direction of approach of the enemy aircraft but if they worked in pairs they could also work out the position of the aircraft. This particular one at Boulby was positioned some 600 metres from the cliff edge to exclude noise from the sea. Boulby cliffs are the highest cliffs on the east coast of England and from this location the sound mirror would have been able to give warning of Zeppelins approaching Skinningrove Steel Works. The Steel Works were a strategically important industrial target which during WWI also produced TNT and Mustard Gas. There were several fatal accidents with regard to this production and the graves of those involved can be found in Brotton old cemetery including two Australian munition workers who were part of the skilled labour force which this process required.

John D Hunter, 8 July 2013

I have since found out that there were in fact six sound mirrors along the North East Coast,four of which still exist. These are at Boulby, Kilnsea, Redcar and Sunderland. The other two which have since been demolished to make way for housing were at Hartlepool and Seaham

John D Hunter , 10 September 2013

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