General   (General discussion, talk about anything.)

I USED to be one of those chappies referred to one of my many duties was to create ones if needed ,also the person broady who said they the bench marks are a true fact of the height and at that particular is spot on I have been down to NEWLYN scores of times it's referre to by us O/S guys as "THE TIDE GUAGE LEVEL" the heights used by the one in photo gives you an accurate height,but has anyone SEEN THE "BRASS/GUNMETAL ONES NORMALLY SET IN AND ON THE FACES OF MORE STABLE STRUCTURES IE , CHURCHES, RAIL W/BRIDGES OLD COUNCIL TYPE BUILDINGS, WHENEVER YOU SEE THOSE THE MEASUREMENT TAKEN AT THOSE FALL INTO 3 CATEGORIES.
( 1 ) TERTIARY.
( 2 ) SECONDARY.
( 3 ) GOE-DETIC
The latter was measurement's to highest level.
No 2 is what in the photo would be used for a slight lower accuracy,
No1 was mainly a quick measurement at again a lower accuracy,
THIS does not mean that the VALUES were in any way not accurate it all depended on the particular area of what was needed.
I hope you found this interesting.