1GL Bolt: Thirsk, Church   

Bolt in South side of St. Mary's Church tower, Thirsk ; 6.44 ft. above surface [1GL, Selby to Newcastle-upon-Tyne, Mark No. 85] [1GL, Kirkby Kendal to Thirsk, Mark No. 193] - approximate location; evidently NOT the same as CUT MARK: THIRSK PARISH CH TWR SW FACE S BUTT (height 37.5741m, 0.6m above ground, 3rd order).

Location
Grid reference: SE 4271 8231.
Landranger 99: Northallerton & Ripon, Pateley Bridge & Leyburn.
Structure: Church.
Waypoint: BT0600.

Neighbouring Bench Marks

BM	Thirsk, Long Street 406.08m to the northeast.
RIVET	Thirsk Bridge 487.54m to the southeast.
BM	Thirsk Bridge 501.60m to the southeast.
BOLT	Thirsk Bridge 505.67m to the southeast.
BOLT	Sowerby, St. Oswald's Church 1.03km to the southeast.

The nearest fundamental bench mark is Northallerton, 11.31km 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 128.2760 feet [39.0985 metres] above mean sea level (Liverpool datum). It was included on the Kirkby Kendal to Thirsk and Selby to Newcastle-upon-Tyne levelling lines. The surveyor's description was Bolt in South side of St. Mary's Church tower, Thirsk ; 6.44 ft. above surface.