Too easy. It's a javelin gauge.

At my school we used to sneak round a corner and throw them at a wooden door. Never occurred to us someone might open it! Stupid boys…

Dave

This component isembeded into a cement base( it is in the picture upside down) the threaded hole will have a support of some sort being used by a surveyor.

I have seen several different kinds and have a couple I chop chop up for small items I make.

So my £ worth it is a surveying marker.

Clive

Hi, Clive may well be correct, I was wondering about the threaded hole. The company I used to work for many years ago had large heavy concrete blocks cast into solid stable ground in parts of the exhausted quarries, with a bronze plate with a pin sticking from it and surveyors used to come every six months or so for several years to check any subsidence of the land surrounding the old quarries. looking at the rule, the round disc part is about the size these embedded bronze plates were.

Regards Nick.

Yes I know this is a segway… assuming the part is a survey mark

It's Been a while since I posted on this forum. The past couple of years have been very hectic.
Next Wednesday we pick up the keys to a new house. After 38 years in one house we are moving to the hills about a 45 minute drive from Melbourne.

I wish to build a new shed and in order to do so the council requires survey, I was on site when this was done in order to discuss the location. And yes the EPOXY CNC mill post on this forum will continue when the shed to house it is built.

A Land survey starts not at your property but at the known reference points in the area. One of those points was in a council field nearby, about a foot below the grass! Using the very accurate GPS station that surveyors use he had no problem locating it. The surveyor told me that there are many of these hidden reference marks around the city. The importance of the mark determines how it is founded, the more important ones may sit on hidden but massive concrete foundations.

Looks like one of those things they sell in kitchen shops to measure out portions of spaghetti.

Rod

In older parts of the UK we often have benchmarks, typically what looks like a 'WD' arrow but usually with a horizontal line above.

Something petroleum industry based, made of bronze to eliminate sparks from impact of other metal objects ?

Hoist with own petard Dave, methinks

DaveD

I am not absolutely sure but I think that the horizontal mark iis to determine elevation, I have a couple around here that state the hieght. One says, '48 feet'.

Probably a piece that fell off the tractor mowing the playing field.

Probably correct. The 2019 probably refers to the larger 20mm GO hole and the 19mm NO GO hole. Sorts the 20mm mens javelins from the 19mm womens javelins. Well, maybe…