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how

 

THE ART, THE SCIENCE
+  THE FAQ... [COMING SOON.]


 
 

A metre is a metric that is, by now, well understood — defining a standardised distance between two points in space. Yet the nature of its becoming — its raw extraction from the Earth and the journey that led to its definition, is a story that is not necessarily familiar to us all — it was not to me at least, at the beginning of this investigation!

My fascination with the metre stems from my interest in the ‘measuring of things’ and the self-imposed mechanisms that we have created to standardise our experience of life in both a scientific and societal sense. John Culkin once stated: “We shape our tools and thereafter our tools shape us” and it is from this position of self-reflexivity that I have come to consider the metre.

étalon is a project designed to engage with the metre in a physical, emotional and scientific sense. While much will be written elsewhere regarding the former components, here I outline my system of scientific engagement — describing the observational framework that will be employed throughout the project to measure the Earth and its unfolding curvature, and to define a new ‘metre’ length as a result.
 

HOW WAS THE ORIGINAL METRE DEFINED?

The metre was originally proposed during the Napoleonic-era — the result of a large-scale surveying expedition undertaken by the French astronomers <Delambre and Mechain> in 1792 at the behest of the French Academy of Sciences. Contrary to existing ‘standard’ measures of the time, the metre was to be determined ‘of the Earth itself’ — defined to be one ten-millionth of the circumferential distance from the Earth’s pole to its equator. Given the impossibility of taking such a measurement directly (and noting, of course, the absence of helpful space-based observational platforms) a system of ‘<triangulation>’ was employed to measure the length of a 10 degree segment of the Meridian of France, spanning from Dunkerque in the north to Barcelona on the Spanish coast. This distance was then extrapolated to estimate the full meridional measure, and the metre defined as one ten-millionth of this overall value.
 

 
 Click through for interactive map by Ken Alder

Click through for interactive map by Ken Alder

 

In order to compute the length of the meridian arc, Delambre and Mechain employed a system based on surveying — measuring the angles associated with a ‘triangulation’ of numerous geospatial ‘points’ that straddled the meridian. These measurements typically involved observing the angular displacement between various natural and constructed landmarks enroute: mountain peaks, church steeples, etc.The two geodesists expedition was fraught with <numerous difficulties> indicative of the tumultuous political tensions [and the extraordinary challenges associated with such scientific undertakings] at the time.
 

WHAT ABOUT ÉTALON –
IS THIS AN HISTORICAL RE-ENACTMENT?

No — despite its many enrapturing elements, the original expedition of Delambre and Mechain serves only as a loose model for etalon, which instead aims to engage with the physicality embodied by the metre and the journey that defined it. Unpacking the conceptual premise that we measure only by measuring against, etalon aims to vest knowledge of the scale and character of our planet in the bodies of each participant through the act of walking — a slow and introspective contemplation of distance travelled and time marked.

Nonetheless, I do intend etalon as an homage to the classical construction of the metre, and as such, I have attempted to develop a system that replicates the spirit of the original survey, if not its specific methodology. Throughout etalon, I too will set out to measure the length and angular displacement associated with arcs inscribed on the Earth’s surface, and through the staging of daily observations, will collect data that enables an estimation of the Earth’s radius and its circumference. Consistent with the original metric definitions, I will in turn generate a new ‘metre’ length — defined as one ten-millionth of the arc-length spanning from the pole to the equator [as per my estimates].

Specifically, this process will involve measurements conducted between two observers. At the commencement of each experiment, the pair will pace out an arbitrary distance, measure their latitude and longitude coordinates, and, finally, the length that separates each from the other. If a metre is thought of as the distance between two points, thus is the mode of this experiment revealed.

 
etalon_diagram.png
 

Measuring by a constellation of fake stars

While Delambre and Mechain conducted their measurements ‘the hard way’ — computing the latitudes and longitudes of the end-points of their meridian arc based on detailed astronomical observations, I will exploit modern technology for all it’s worth! Throughout etalon, we will employ GPS technology to measure our angular positions, and a laser rangefinder to estimate distance. Rather than attempting to obtain a single, highly accurate estimate of the Earth’s geometry (a’la Delambre and Mechain) we will measure regularly — obsessively surveying the landscape cleaved by the meridian to build a statistical model of the Earth’s characteristics. The final values reported for etalon will be average measures — representing the cumulative contributions of all participants.

This data will be made available throughout the course of the project, via regular updates to our provisional Earth radius and ‘metre’ estimates.

 

But is the Earth really a sphere?

No, not exactly, but it is pretty close. The characteristics of the Earth have nowadays been very accurately surveyed using dedicated satellite systems, and is generally modelled as a slightly ‘<flattened ellipsoid>’. The departure of the Earth from a perfect sphere is not fantastically significant though: the Earth’s radius varies between 6,384 km and 6,353 km at its maximum and minimum extents.

It is also worth discussing the ‘nature’ of the science to be completed for etalon in this context — etalon is not intended as a detailed scientific survey of the Earth, but is rather a performative art project that incorporates some aspects of science in its realisation. While we will, of course, endeavour to measure the Earth as faithfully as possible, the focus here is on the experience of doing so, rather than the accuracy of the result.

 

How is the contemporary metre defined?

Based on the speed of light and the length of the second — but that’s a <whole other story>!