Swiss vs English lever escapement 

Thank you

. In this video, the pointed teeth of the English lever escapement wheel are slightly bent to accommodate a smaller diameter. What may shock you compared to the old movements the pointed teeth are straight and take up a little more space. However, it is necessary to look at the functional aspect of the tooth and not the aesthetic aspect. . I avoid discussing the origin of the name Swiss lever escapement because that is not the purpose of these videos. Look however in the book 'The Art of Breguet' by George Daniels pages 310 to 313 there are several club-toothed escape wheels. (Abraham-Louis Breguet 1747-1823)

Let me second @@Waterpearl_escapement in that the "Swiss lever" is usually characterised by the "divided lift", while the "English lever" has impulse planes on the pallets only. NB: you can also have impulse planes on the lever only but those arrangements were never popular.

@@lmmr1 thank you for your additional information

@@Waterpearl_escapement Sorry, I meant to write that in some lever escapemts the impulse plane is on the *wheel teeth* (see Britten's The Watch & Clock Makers' Handbook, 9e, p.219).

@@Waterpearl_escapement Thanks for the information. I have been trying to find the origin of the club-toothed lever for years. I have seen various, similarly-shaped teeth in other watches but the example I have, made in the early 1830s, appears to be the 'finished' version. It is contained in what most people would describe as an ordinary, working man's watch, made in Liverpool. I think this suggests that it wasn't a 'one-off' and was probably part of an established production of this type. That is why, in the absence of contrary information, I ascribed its invention to the North-West of England.

Watch escapements are strongly inspired by pendulum escapements

Merci beaucoup Joseph pour cette remarque