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ed that the multiples and sub-multiples of each kind of measure, whether of weight, capacity, surface, or length, shall be always taken in the decimal or decuple proportion, as the most simple, natural, and easy for calculation, according to the system of numeration which all Europe has used for many centuries.
The Institute (National Institute of France) ordered a new and actual measure of the whole are of the meridian extending the whole length of France, from Dunkirk on the north to Barcelona in Spain, and passing Paris, an extent of almost 10°. The measurement of this are employed Mechain and Delambre for several years.
They employed rods of platinum of 12 feet in length for measuring the bases; and whole circles, accurately made, for taking the angles to 10ths of seconds, by repeating the measures in different parts of the circumference, and taking the mediums of the whole.
The precision with which the angles were observed is such that, out of 90 triangles which connect the