1GL Bolt: Sowerby, St. Oswald's Church   

St. Oswald's Church, Sowerby. Bolt in South face of tower ; 4.61 ft. above surface [1GL, Selby to Newcastle-upon-Tyne, Branch Levelling from Mark No. 82(c)]; PA BOLT TWR ST OSWALDS CH SE FACE 2.3M S ANG (height 36.0030m, 1.5m above ground, 3rd order).

Location
Grid reference: SE 4310 8136.
Landranger 99: Northallerton & Ripon, Pateley Bridge & Leyburn.
Structure: Church.
Waypoint: BT0601.

Neighbouring Bench Marks

RIVET	Thirsk Bridge 741.69m to the north.
BOLT	Thirsk Bridge 743.30m to the north.
BM	Thirsk Bridge 753.26m to the north.
BOLT	Thirsk, Church 1.03km to the northwest.
BM	Thirsk, Long Street 1.20km to the north.

The nearest fundamental bench mark is Northallerton, 12.26km to the north.

First Primary Levelling, England & Wales (1840-60)
This bench mark was used during the First primary levelling, England & Wales, and was levelled with a height of 118.3660 feet [36.0780 metres] above mean sea level (Liverpool datum). It was included as a side level on the Selby to Newcastle-upon-Tyne levelling line. The surveyor's description was St. Oswald's Church, Sowerby. Bolt in South face of tower ; 4.61 ft. above surface.