Friday, April 7, 2017

Rolex Patent: California Dial June 15, 1942


Rolex Patent Application


California Dial

June 15, 1942

In the past, I have written extensively about the art deco Rolex California Dial. The significance of this dial  is it is the basis of the dial on the Rolex Submariner, SEA-DWELLER and GMT-Master.

Sverker is a reader of Jake's Rolex World from Sweden. He wrote in recently and sent me a copy of the original patent application for what now is commonly referred to as The California Dial.




Sverker not only sent in the patent application seen above and below in this post, but also translated the while thing from French to English and here is what it says:

The object of the present invention is a timepiece dial. This dial is characterized in that it comprises hourly signs constituted by Roman numerals and others by Arabic numerals. 

The accompanying drawing shows, by way of example, four embodiments of the object of the present invention. 

FIG. 1 is a plane of the first embodiment. Figs. 2, 3 and 4 are small-scale planes, the second, respectively the third and fourth embodiments. 

The dial of FIG. 1 is a round dial with an hour circle with twelve signs, one for each hour. The signs for hours 10 and 11 and 1 and 2 are Roman numerals, those for hours 4 and 5 and 7 and 8 by Arabic numerals and those corresponding to noon6 o'clock3 o'clock and 9 o'clock, By simple geometrical elements, namely a triangle and three horizontal sticks.

It will be seen that this layout gives a clear and simple turn of the hours, easy to realize with luminous material and allowing an easy reading of the time especially for wristwatch boxes whose dials are relatively small. In fact, the fact that the Roman numerals occupy half the dial and the Arabic numerals the other, clearly distinguishes these two halves. In addition, the Roman numerals chosen are those which are the simplest to perform and the easiest to read.

In the other three embodiments, the hourly sign corresponding to time 5 is constituted by the corresponding Roman numeral and the hourly sign corresponding to 6 hours is constituted by a very short vertical line. In the embodiment of FIG. 2, the sign corresponding to noon, is indicated by a vertical line, in that of fig. 3, by two vertical lines and, in that of FIG. 4, by a short stroke surmounted by a half-circumference. Of course, the aforementioned provisions could be applied to dials of a shape other than round and other arrangements would still be possible


CLAIM

Dial of timepiece, characterized in that it comprises hourly signs co-located by roman numerals and others by arabic numerals. 

SUB-CLAIMS: 

1. Dial according to claim 1, characterized in that it comprises: In addition, time symbols constituted by triangular geometrical elements.
2. The dial as claimed in claim 1, wherein the symbols corresponding to the hours 10 and 11 and 1 and 2 are constituted by Roman numerals.
3. Dial according to claim 4, characterized in that the signs corresponding to Hours 4, 7 and 8 are Arabic signs.
4. Dial according to claims 1 to 3, characterized in that the corresponding 5-hour sign is the corresponding Roman numeral.
5. Dial according to claim 1, characterized in that the remaining digits are constituted by geometrical elements.
6. Dial according to claims 1 to 3, characterized in that the sign corresponding to 5 hours is constituted by the corresponding Arabic numeral.
7. Dial according to claim 6, characterized in that the remaining signs are constituted by the geometric elements.


MONTRES ROLEX S. A. Mandataire A. BUGNION, Genève.



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