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TP7570 - Salisbury Plain Baseline South
[UK map]
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Historic use :
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There are 13 photos for this trigpoint (view album).

This trigpoint:
Is ranked joint 6298th with 28 other trigs (more).
Has a mean score of 5.40/10 (from 20 logged visits)
Was First logged: 10th Oct 1994
Was Last logged: 9th Aug 2018

Of the 20 logged visits,
5 recorded a location and of these....

All were within 33m
The average error was 15m
The closest was 7m

SALISBURY SALISBURY Bemerton Church Tower Spire Bemerton Church Tower Spire Avon Farm Avon Farm Devizes Road School Devizes Road School St Lawrences Church Tower Centre St Lawrences Church Tower Centre Nestles Factory Chimney Nestles Factory Chimney Old Sarum Old Sarum St Pauls Church Tower Vane St Pauls Church Tower Vane St Francis Church Tower Cross St Francis Church Tower Cross Port Way Port Way St Edmunds Church Tower Centre St Edmunds Church Tower Centre Bishops Down Farm Bishops Down Farm Roman Road Roman Road Cemetery Cemetery Hill 208 Hill 208 Long Barrow Long Barrow Queen Manor Aux Queen Manor Aux Queen Manor Farm Queen Manor Farm meandmymum meandmymum CJO CJO arranc arranc jonglew jonglew bikeboyz bikeboyz Salisbury Plain Baseline South Salisbury Plain Baseline South [Zoom In/Out] [Hide Labels]

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Selection of photos for this Cannon.

By asbown

By meandmymum
Salisbury Plain Baseline South
By Dusty
By Dusty
Stone text
By bikeboyz
See 7 more in the album.

Logged Visits:

Good condition 9th Aug 2018  14:50  by asbown

FB Number: Not logged  Condition: Good  Score: 5/10

tricky little climb over the fences.

Good condition 1st Jun 2018  09:08  by Ted Mariner

FB Number: Not logged  Condition: Good  Score: 5/10

The stone is almost unreadable thanks to the ravages of time and the awful font used. I took along a whacking stick to clear the nettles, very glad that I did. The cannon muzzle was barely visible thanks to the undergrowth in the field. Sorry to report that the pig farmer that owns the field has now erected a second barbed wire fence that makes a quick trespass almost impossible unless you want to leave portions of your genitalia behind.

Not Logged 14th Oct 2017  15:48  by meandmymum

Gridref: SU 14200 32900   FB Number: Not logged  Condition: Not Logged  Score: 7/10

Parked on verge of minor road opposite entrance to Old Sarum and walked back to monument. Inscription getting hard to decipher, but cannon easily spotted!

Couldn't find it 15th Jul 2014  12:45  by pork_pie_hat

FB Number: Not logged  Condition: Couldn't find it  Score: 2/10

Walked down from Old Sarum Castle. Stood beside the monument, but couldn't see the cannon due to height and density of roadside vegetation. Had I looked at the photos first, I might have had a better idea what I was looking for and where to look for it, so probably my own fault.

Good condition 22nd Apr 2014  09:03  by CJO

Gridref: SU 14216 32937   FB Number: Not logged  Condition: Good  Score: 7/10

Field flooded up to almost the cannon, which was keeping itself just above water level as it is located on a ridge beside the field edge.

Salisbury Plain Baseline South

Good condition 24th Mar 2014  16:15  by Wubbleyew

FB Number: Not logged  Condition: Good  Score: 6/10

Shame that the baseline monument is now just about unreadable; it's in need of some restoration. The cannon was easily seen - less easy was the clambering over the prickly barbed wire fences in full view of the Salisbury rush hour traffic. Field remains flooded, but fortunately the water is some inches beyond the cannon.

Good condition 21st Sep 2013  09:45  by Dusty

FB Number: Not logged  Condition: Good  Score: 5/10


Unreachable but visible 9th Aug 2013  18:45  by bikeboyz

Gridref: SU 14215 32945   FB Number: Not logged  Condition: Unreachable but visible  Score: 5/10

Heavily overgrown but the mussel can be just made out through the weeds. It does seem scandalus that such an important monument is both left in such a condition and inaccessible. I think I shall have to make some inquiries with Wiltshire Council etc.

Standing stone monument and field location
Stone text
poor digital camera focus on the cannon

Good condition 22nd Apr 2013  10:46  by jonglew

Gridref: SU 14217 32942   FB Number: Not logged  Condition: Good  Score: 5/10

Visited just after seeing and photographing the Old Sarum surface block. The field boundary consists of a double barbed wire fence so hopping over is not easy, but can be achieved with care. The field has now been given over to pigs and is also largely under water, fortunately the cannon isn't - at the moment. The location for the Salisbury Plain baseline was selected by the surveyors, William Mudge and Isaac Dalby, in July 1793, but it wasn't until the following year in Jun 1794 that they carried out the measurement, which they completed in 7 weeks. The baseline was needed to act as a 'base of verification' for the triangulation that had been done so far in the southern counties before they continued to push into the southwest.

Upturned Cannon TP7570©jonglew
Detail TP7570©jonglew

Good condition 16th Feb 2013  10:20  by THE CYCLIST

FB Number: Not logged  Condition: Good  Score: 5/10

Good condition 11th Jan 2013  13:30  by arranc

Gridref: SU 14217 32940   FB Number: Not logged  Condition: Good  Score: 5/10

viewed fron road over hedge by monument

Good condition 7th Apr 2012  15:00  by peregrinus

FB Number: Not logged  Condition: Good  Score: 6/10

Visited after Old Sarum, which is a P30m summit, and also a SB which I didn't know about :-(

Good condition 13th Nov 2011  09:45  by Dart More

FB Number: Not logged  Condition: Good  Score: 6/10

Historically interesting. Farmer wasn't so pleased with me hoping over the fence to stand on the actual spot though ! Canon isn't in such good condition as in dal's photo

Good condition 16th Nov 2010  12:30  by cmb1953

FB Number: Not logged  Condition: Good  Score: 7/10

Good condition 17th Oct 2010  01:30  by bluebeard

FB Number: Not logged  Condition: Good  Score: 1/10

Good condition 3rd Oct 2010  14:00  by dal

FB Number: Not logged  Condition: Good  Score: 7/10

Very interesting. End of cannon clear in field. There is a Bench Mark on the top of the cannon. Also visited the other end of the base line today.

The cannon Note the arrow, which marks a Bench Mark

Good condition 5th Aug 2010  16:30  by sky high boys

FB Number: Not logged  Condition: Good  Score: 8/10

Points for historical interest, thanks for posting, tom. Visiting Stonehenge today and fancied a handy trig or two.

Good condition 13th Mar 2010  15:45  by Trigger

FB Number: Not logged  Condition: Good  Score: 5/10


Good condition 19th Nov 2009  14:02  by tom

FB Number: Not logged  Condition: Good  Score: 3/10

The trig consists of the top of an upturned cannon buried in a field next to the A345 to the north of Salisbury. It was used to mark one end of the Salisbury Plain base line of the 1794 triangulation. It is situated in the field behind a monument commemorating this. I noticed the monument while walking along the road. I did not know that the cannon was still in place until I got home and did some research. The cannon can just be seen in the photo I took of the commemorative monolith. The surrounding landscape is mostly of flat farmland. Castle Hill and Old Sarum rise up to the south. Some downs can be seen to the west and a distant ridge forms the backdrop to the east.

Good condition 10th Oct 1994  15:00  by descarte1

FB Number: Not logged  Condition: Good  Score: 8/10

Bit of a back-log this one in a pre-trigging era. Visited Old Sarum and the custodian mentioned the baseline monument at the bottom of the hill and to look for the cannon end in the field.....found it.

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