Regulier-Exzenter Screw-like masses, with an off-centre mass distribution, attached to the balance wheel rim. Turning them changes the moment of inertia and causes the balance to oscillate faster or slower.

Semi-oscillation Also: vibration. Half of the path travelled by the balance wheel from end point to end point.

Richard Lange (1845 – 1932). Der erstgeborene Sohn Adolph Langes. Erwirkte 27 Patente und Gebrauchsmuster. Entdeckte u. a. Beryllium als eigenschaftsverbessernden Legierungsbestandteil für Uhrenfedern und gilt daher als geistiger Vater der Nivarox-Spirale.

Spring barrel A small metal drum with teeth, which accommodates the coiled mainspring. The mainspring stores the energy that runs the watch.

German silver Special alloy composed of copper and zinc, with a nickel concentration of about 10%. German silver is stronger than brass and has been traditionally used by Lange for the manufacture of plates and bridges. The addition of nickel minimises the oxidation of German silver and thus eliminates the need to electroplate the alloy - it can remain "untreated".

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

Blued steel, blued screws Steel parts are slowly and cautiously heated (annealed) to about 300°C. This process coats the metal with an extremely thin, shimmering film of cornflower-blue magnetite (Fe3 O4).

Gold chaton The gold setting of a bearing jewel - in Lange watches, chatons are often secured to the three-quarter plate with two or three screws.

The design of the manually wound L041.2 movement is focused on attaining the ultimate in reliability and rate accuracy. The large | balance wheel with eccentric poising weights beats at a frequency of 21,600 | semi-oscillations per hour. Its | balance spring was developed by Lange's master watchmakers and is manufactured in-house. It is attached with a patent-pending clamp that, unlike other constructions, does not deform the spring in the stud but instead merely secures it to simplify any future adjustments that may be needed. The balance wheel and the balance spring were harmonised with each other across the numerous test series of a sophisticated research programme. The new balance spring reflects what is probably | Richard Lange's greatest accomplishment. In 1930, he had filed the application for Patent No. 529945 "Metal alloy for watch springs". In his invention dossier, he described that the admixture of beryllium offsets the disadvantages of conventional springs, namely inadequate elasticity and insufficient hardness. The | spring barrel stopwork is another design measure that increases the rate accuracy of this watch. Thanks to this device, the going train of the RICHARD LANGE is continuously powered at nearly constant torque over a period of 38 hours. The wheel that carries the seconds hand is driven by a separate train that runs under its own meticulously decorated bridge. The movement of the RICHARD LANGE is endowed with all of the typical features that make Lange watches so precious: hand-finished bridges and plates in untreated | German silver, | blued-steel screws, screwed | gold chatons, and a hand-engraved | balance cock. The masterpiece incorporates 26 jewels to minimise mechanical friction and is precision-adjusted in five positions.