In reading the reports of the discussions of that Congress, I was struck with the fact that in an assembly of so many learned men and eminent theorists it was the practical side of the question that was chiefly considered, and which finally determined the character of the resolutions adopted.
Thus, instead of laying down the great principle that the meridian to be offered to the world as the starting-point for all terrestrial longitudes should, have above all things, an essentially geographical and impersonal character, the question was simply asked, which one of the meridians in use among the different observatories has (if I may be allowed to use the expression) the largest number of clients? In a matter which interests geography much more than hydrography, as most sailors acknowledge, because there exist really but two initial hydrographic meridians, Greenwich and Paris, a prime meridian has been taken, the reign (practical influence) of which is principally over the sea; and this meridian, instead of being chosen with reference to the configuration of the continents, is borrowed from an observatory; that is to say, that it is placed on the globe in a hap-hazard manner, and is very inconveniently situated for the function that it is to perform. Finally, instead of profiting by the lessons of the past, national rivalries are introduced in a question that should rally the good-will of all.
Well, gentlemen, I say that considerations of economy and of established custom should not make us lose sight of the principles which must be paramount in this question, and which alone can lead to the universal acceptance and permanence of its settlement. Furthermore, gentlemen, these motives of economy and of established custom, which have been appealed to as a decisive argument, exist, it is true, for the majority in behalf of which they have been put forward, but exist for them only, and leave to us the whole burden of change in customs, publications, and material.
Since the report considers us of so little weight in the scales, allow me, gentlemen, to recall briefly the past and the present of our hydrography, and for that purpose I can do no better than to quote from a work that has been communicated to me, and which emanates from one of our most learned hydrographers. "France," he says, "created more than two centuries ago the most ancient nautical ephemerides in existence. She was the first to conceive and execute the great geodetic operations which had for their object the construction of civil and military maps and the measurement of arcs of the meridian in Europe, America, and Africa. All these operations were and are based on the Paris meridian. Nearly all the astronomical tables used at the present time by the astronomers and the navies of the whole world are French, and calculated for the Paris meridian. As to what most particularly concerns shipping, the accurate methods now used by all nations for hydrographic surveys are of French origin, and our charts, all reckoned from the meridian of Paris, bear such names as those of Bougainville, La Pérouse, Fleurieu, Borda, d'Entrecasteaux, Beautemps, Beaupré, Duperrey, Dumont d'Urville, Daussy, to quote only a few among those who are not living.
"Our actual hydrographic collections amount to more than 4,000 charts. By striking off those which the progress of explorations have rendered useless, there still remain about 2,600 charts in use. Of this number more than half represent original French surveys, a large part of which foreign nations have reproduced. Amongst the remainder, the general charts are the result of discussions undertaken in the Bureau of the Marine, by utilizing all known documents, French as well as foreign, and there are relatively few which are mere translations of foreign works. Our surveys are not confined to the coasts of France and of its colonies; there is scarcely a region of the globe for which we do not possess original work—Newfoundland, the coasts of Guiana, of Brazil, and of La Plata, Madagascar, numerous points of Japan and of China, 187 original charts relative to the Pacific. We must not omit the excellent work of our hydrographic engineers on the west coast of Italy, which was honored by the international jury with the great medal of honor at the Universal Exhibition of 1867. The exclusive use of the Paris meridian by our sailors is justified by reference to a past of two centuries, which we have thus briefly recalled.
"If another initial meridian had to be adopted, it would be necessary to change the graduation of our 2,600 hydrographic plates; it would be necessary to do the same thing for our nautical instructions, (sailing directions,) which exceed 600 in number. The change would also necessarily involve a corresponding change in the Connaissance des Temps."
These are titles to consideration of some importance. Well, if under these circumstances the projected reform, instead of being directed by the higher principles which ought to govern the subject, should take solely for its base the respect due to the established customs of the largest number and the absence on their part of all sacrifice, reserving to us alone the burden of the change and the abandonment of a valued and glorious past, are we not justified in saying that a proposition thus made would not be acceptable?
When France, at the end of the last century, instituted the metre, did she proceed thus? Did she, as a measure of economy and in order to change nothing in her customs, propose to the world the "Pied de Roi" as a unit of measure? You know the facts. The truth is, everything with us was overthrown—both the established methods and instruments for measurement; and the measure adopted being proportioned only to the dimensions of the earth, is so entirely detached from everything French that in future centuries the traveller who may search the ruins of our cities may inquire what people invented the metrical measure that chance may bring under his eyes.
Permit me to say that it is thus a reform should be made and becomes acceptable. It is by setting the example of self-sacrifice; it is by complete self-effacement in any undertaking, that opposition is disarmed and true love of progress is proved.
I now hasten to say that I am persuaded that the proposition voted for at Rome was neither made nor suggested by England, but I doubt whether it would render a true service to the English nation if it be agreed to. An immense majority of the navies of the world navigate with English charts; that is true, and it is a practical compliment to the great maritime activity of that nation. When this freely admitted supremacy shall be transformed into an official and compulsory supremacy, it will suffer the vicissitudes of all human power, and that institution, (the common meridian,) which by its nature is of a purely scientific nature, and to which we would assure a long and certain future, will become the object of burning competition and jealousy among nations.