If there is one type of complications that is most popular, it has to be the chronograph. Nearly all brands have one (or more) in their collection, and there are only few watch connoisseurs and collectors that don’t have one as well.

Patek Philippe Ref 5370 Split-seconds Chronograph Watch Baselworld 2015 Front

Why is the chronograph so popular? Perhaps it is the fact that for once, we feel that we can control time when we operate a chronograph. Designed to measure elapsed time, they became a wearable tool for anybody who needs this professionally or enjoys it privately. For pilot’s they can serve as a backup for their computer, and for divers the same. Even for astronauts, it can be a life-saver, as the incident with the Apollo 13 proved beyond any reasonable doubt.

The Big Bang Unico Retrograde Chronograph UEFA Champions League watch

Although very popular, building a chronograph is not the easiest thing to do. In fact, some very respected watchmakers would consider a split-second chronograph the most challenging complication to make. You need to be able to connect, and disconnect, a gear train to the running movement of your watch. This will temporarily power the chronograph function, which allows you to measure the time for that period. While there are various forms to do this, the vast majority of them work in a similar fashion as a car, where the clutch lets you engage and disengage the gear train of the transmission to the engine.

The case may be the first thing that catches the eye, but the movement is the star with the show. Unlike many shaped watches, the Millenary’s in-house caliber 4101 movement fits the situation and follows its form perfectly. However at first glance this may look like a so-called skeleton observe, in fact it is not – no material has been removed from any component to enhance the view. The small dials leave plenty of room to enjoy the traditionally-finished movement beneath, and the sapphire display back offers visual enjoyment from that side likewise.

Zenith Harrods Limited Edition El Primero Chronomaster 1969 Watch Exhibition May 2015

It is the speed, or in watch terms the vibrations per hour, of the movement that determine the accuracy of the chronograph. Old fashioned manual wind chronographs often had movements that have 18.000 vibrations per hour so that they can record only with an accuracy of 1/5th of the second. This is why Zenith’s introduction of the El Primero was such a landmark event in 1969, as this high-frequency movement has 36.000 vibrations per hour, enabling it to measure up to 1/10th of a second.

Tudor Fastrider Chronograph 2015 Yellow

A lot of brands have important company milestones in relation to the chronograph. Graham invented the very first clock that could measure elapsed time, while Louis Moinet created the first hand-held chronograph. Omega created the chronograph that went to the moon, while TAG-Heuer has a long history of timing (F1) races. Almost every brand has a connection to this one complication, a complication that is close to the heart of so many watch collectors and connoisseurs. That is why this month every Friday at Haute Time is dedicated to the chronograph, exploring all sides of this unique complication.