What are the "three major complications" of a watch?

The so-called "three major complications" generally refer to minute repeater, perpetual calendar and tourbillon.

1, the minute repeater watch, is a three-reed watch, through the three kinds of different sounds of the spring, can distinguish the "hour", "quarter", "minute" time, and then do not need to look at the dial! Pointers can also know the specific time, this function was initially designed for visually impaired users, but the development of later, because of the beautiful sound of the reason, has been a practical function of the gorgeous transformation into a top watch complications, or art form.

2. The perpetual calendar function is closely related to the breadth of the calculation of time, not just the general display of hours, minutes and seconds, but includes a more complete time display mechanism that can recognize leap year months. As we all know, there are 365 days in a year, divided into 12 months, but seven of those 12 months are 31 days, four are 30 days, and one is 28 or 29 days. It is not easy to represent these seemingly irregular periods of time completely and accurately, and the masters of tablature have been tireless in their explorations and experiments to this end, one after another.

3. Tourbillon is a kind of clock and watch regulating device invented by Mr. Louis Breguet, the Swiss master watchmaker, in 1795, which aims at correcting the error caused by gravity on the clock and watch parts, and also represents the highest craft of mechanical watch technology. A small tourbillon mechanism consists of more than 70 delicate parts, most of which are handmade. At the same time, the fineness and weight of these parts have very high requirements, and it is said that, in general, the weight of the cage and tourbillon cannot exceed 0.3 grams or 0.013 ounces, which is equivalent to the weight of a piece of swan's feather or two pieces of parrot's feather.