Nivarox An alloy composed of iron and nickel with additions of chromium, titanium, and beryllium. It is very suitable for the manufacture of hairsprings, or balance springs, due to its antimagnetic and temperature-compensating properties. The addition of beryllium dates back to a patent awarded to Richard Lange. This chemical element enhances the hardness and elasticity of the alloy.

Balance cock Small metal plate screwed to the visible side of the movement. It carries the balance wheel shaft bearing.

Screw balance A balance wheel that has adjustable screws and tiny washers along its rim.

Three-quarter rotor A special winding rotor in the LANGEMATIK. Its diameter is more than 25% smaller than that of the movement, so it does not conceal the balance wheel while its motion is being observed through the sapphire-crystal caseback.

Whiplash precision index adjuster An adjusting device composed of a steel spring in the shape of a swan's neck, a pointer, and a setscrew. The screw is used to adjust the beat, or the timing, of the watch in very small increments.

ZERO RESET Patented mechanism that simplifies the synchronisation of the watch with a time signal. When the crown is pulled, it automatically causes the seconds hand to jump to the 12 o'clock (zero) position.

Chamfering Also: angling, bevelling. The breaking and polishing of sharp edges on bridges and levers. The inclined surface has the same width along its entire circumference or length.

Synthetic ruby All references to the term "ruby" mean friction-reducing, wear-resistant jewels made of synthetically produced ruby for bearings, switching elements, and certain clicks. Because the homogeneity of its crystalline structure is better than that of natural rubies without any trade-off in terms of physical and chemical properties, synthetic ruby now dominates virtually all applications where jewels are required.

Perpetual calendar The calendar display of a mechanical watch is called "perpetual" if it automatically updates the date, the day of the week, the month, and the moon phase displays. It not only takes into account the different durations of the months in the course of a year but also "knows" which years are leap years. The complex mechanism is controlled by so-called cams.

Not many movements can match the awe-inspiring technical complexity of the calibre concealed in the LANGEMATIK-PERPETUAL. No fewer than 478 individual parts, representing a densely packed ensemble of highly complicated mechanisms, interact harmoniously in this rare timepiece. The self-winding calibre is powered by a bidirectionally winding | three-quarter rotor crafted from 21-carat gold and platinum. The winding force is transmitted to the | mainspring barrel by a wheel train with four ball bearings that eliminate friction almost completely. It can store enough energy for up to 46 hours of autonomy. The | three-quarter rotor exposes the precious going train, showcasing the shock-proofed | screw balance with the | Nivarox-1 balance spring, the hand-engraved | balance cock, and the | whiplash precision index adjuster which allows the rate of the watch to be fine-tuned without requiring the removal of the balance wheel. The | ZERO RESET mechanism is another patented solution devised by Lange and quite probably unparalleled in precision watchmaking. This useful invention greatly simplifies the synchronisation of the watch with a time signal. The complicated | perpetual calendar mechanism is mounted on the dial side of the Lange L922.1 SAX-0-MAT calibre. The movement has 43 synthetic ruby | jewel bearings. All of its surfaces are lavishly decorated by hand, even those normally invisible for the eye of the beholder. The edges of the movement parts are | chamfered and polished. And after assembly, the movement is adjusted in five | positions.