De Ville co-axial chronograph watches use the co-axial escapement as well as chronographs, small dials which can keep track of shorter time periods.
The co-axial escapement uses a low friction system and doesn't require lubrication, which has always posed difficulties in watch designs.
These watches use the co-axial escapement technology and are water resistant down to as much as 330 feet, depending on the model.
In 1999 Omega introduced a De Ville watch with their co-axial escapement, hailed as a revolutionary development in watchmaking.
The time in which the escapement or connexion is being completed.
This system of telegraphic printing has a great advantage over the step-by-step system in avoiding the necessity for the rapidly acting electric escapement, which, however skilfully planned and executed, is always liable to failure when worked too rapidly.
He is credited with the invention of the anchor escapement for clocks, and also with the application of spiral springs to the balances of watches, together with the explanation of their action by the principle Ut tensio sic vis (1676).
The motion of the fork is maintained by the clock acting through an escapement, and the dial registers both the number Koenig's of vibrations of the fork and the seconds, minutes and Tuning-fork hours.
According to a revised mining law of 1899 (subsequently amended), all mines are required to be in charge of certified mine managers, mine examiners, and hoisting engineers, when the services of the engineers are necessary; and every mine must have an escapement shaft distinct from the hoisting shaft.
The number of men permitted to work in any mine not having an escapement shaft cannot, in any circumstances, exceed ten during.