“Monsieur, I am a young artist who has only the honor of being known to the public by a new escapement for watches which the Academy has crowned with its approbation and of which the journals have spoken a year ago. _This success fixes me to the state of watchmaker, and I limit my whole ambition to acquiring the science of my art._ I never have thrown an envious eye upon the productions of others of my profession, but it is with great impatience that I see others attempting to take from me the foundation which by study and work I have acquired. It is this heat of the blood, which I very much fear age will never correct, that made me defend with so much ardor the just pretentions which I had to the invention of my escapement when it was contested eighteen months ago. Will you allow me to reply to certain objections to my escapement which in numerous writings have been made public? It is said that the use of this escapement renders it impossible to make flat watches, or even small ones, which if it were true would make the best escapement known very unsatisfactory.” After giving numerous technical details the young watchmaker terminates thus: “By this means I make watches as thin as may be desired, thinner even than have before been made, without in the least diminishing their good quality. The first of these simplified watches is in the hands of the king. His Majesty has carried it for a year and is well satisfied. If these facts reply to the first objection, others reply equally to the second. I had the honor to present to Madame de Pompadour a short time ago a watch in a ring, which is only four lines and a half in diameter and a line less a third in thickness between the plates. To render this ring more convenient I contrived in place of a key a circle which surrounds the dial plate bearing a tiny projecting hook. By drawing this hook with the finger nail about two-thirds of the circuit of the dial the watch is wound up and goes thirty hours. Before taking it to her I watched this ring follow exactly for five days the second hand of my chronometer; thus in making use of my escapement and my construction, excellent watches can be made as thin and as small as may be desired. “I have the honor to be, etc., Caron, _fils, horloger du roi_.”