SIHН 2014: QP a EQUATION by Greubel Forsey

A well-known watchmaker Greubel Forsey presents its next masterpiece of watchmaking – a model QP a EQUATION. The main feature of this model is a perpetual calendar, which remains one of the most "respected" watch complications.

Watchmaker Greubel Forsey rethought the concept of "perpetual calendar", integrated functions of the equation of time in the watch, as well as new practical features and indicators that are designed to facilitate the use of these complex time meters. In creating of a QP a EQUATION watch the priority was to simplify the display, and it was necessary to simplify the configuration of the perpetual calendar, using the bi-directional crown. Thus, despite the pile of indicators and a wide variety of functions, perpetual calendar with equation of time function of Greubel Forsey QP a EQUATION watch as easy to install as a conventional date.

If your watch stopped for a few days and you need to make a flight, then you just need to push the crown to select the desired date on the 2 o'clock position. Selecting the appropriate date, all other indicators will be automatically changed in the strict order. This makes it quite easy to use these watches with such a complication.

Greubel Forsey QP a EQUATION watch

However, to solve this technical problem, watchmaker Greubel Forsey has developed a complicated mechanism of "coding": a kind of mechanical "computer" to create of which have been patented three innovative developments. First, it is a set of cams with movable pins, which shift indicators of front and back dials of the chronometer. This mechanism with cams is placed inside the watch mechanism, without increasing the dimensions of the last. Second - is a cam for a month indication, which changes the indicators of the month located on the front of the main dial, and it also has function of the equation of time, located on the scale at the back of the dial. Third, - the cam of the year indication that provides an indication of leap year in a window, located on the front side of the dial and indication of time, in the window at the back of the main dial. The development of this device does not only change the encoding habitual ways of setting parameters, but also allows you to display them simultaneously on the front and back indicators.

As for the display of current calendar indications, so here everything is clear, but the function of the "equation of time" may cause some questions. So what is it? Horology strives to keep time as accurately as possible, but the fact that the Earth revolves around the Sun in an elliptical path, significantly affects on the precision of the current time. When the Earth approaches maximum to the Sun, the period between successive solar zenith or length of sunny days is changed. This causes a difference between the solar time, which in its turn means that the average time during the year varies from a few seconds to 16 minutes. Function of the time equation - is the conversion of solar and average time. To read the solar time, you need only look at the back dial, which displays the function of time equation.

The case of Greubel Forsey QP a EQUATION watch with diameter of 43.5 mm is made of white gold. Watch is equipped with 24-second tourbillon at an angle of 25°. Oscillations’ frequency of the balance is 21, 600 pc/h. Power reserve is 72 hours. Diameter of the watch mechanism is 37 mm (16, 41 lines), height 9, 55 mm, it consists of 570 components at 65 rubies.

So, the company Greubel Forsey once again delighted the fans of complex time meters, presenting a complex, but easy-to-use model – a wristwatch QP a EQUATION!

Official site of Greubel Forsey.

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