Cut Mark: Thirsk, Long Street   

Old B.M. on N.E. angle of house, W. side of road, N, end of Thirsk [2GL] - tentative identification of approximate location; might or might not be the same as RIVET NO137 LONG ST LEDGE AT N CORNER NE FACE (37.0180m ODN, 0.2m AGL).

Location
Grid reference: SE 4303 8256.
Landranger 99: Northallerton & Ripon, Pateley Bridge & Leyburn.
Structure: Private house.
Waypoint: BM2542.

Neighbouring Bench Marks

BOLT	Thirsk, Church 406.08m to the southwest.
BM	Thirsk Bridge 471.27m to the south.
RIVET	Thirsk Bridge 475.39m to the south.
BOLT	Thirsk Bridge 480.83m to the south.
BOLT	Sowerby, St. Oswald's Church 1.20km to the south.

The nearest fundamental bench mark is Northallerton, 11.06km to the north.

Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 121.4140 feet [37.0070 metres] above mean sea level (Newlyn datum). It was included as a side level on the Bulmer to Northallerton levelling line. The surveyor's description was Old B.M. on N.E. angle of house, W. side of road, N, end of Thirsk.