Understanding the Parts of a Watch

watch nomenclature
1.  Train bridge
2.  Third wheel
3.  Upper third wheel pivot / hole jewel
4.  Set lever screw (detent screw)
5.  Transmission wheel (Crown wheel)
6.  Ratchet wheel (Winding wheel)
7.  Barrel bridge
8.  Clutch wheel
9.  Winding pinion
10.  Set lever
11.  Stem
12.  Crown
13.  Yoke spring
14.  Setting lever spring ( set bridge )
15.  Yoke
16.  Upper forth wheel pivot / hole jewel
17.  Set wheel
18.  Lower barrel arbor pivot / hole
19.  Minute wheel
20.  Mainspring barrel
21.  Center shaft and cannon pinion
22.  Lower forth wheel pivot / hole jewel
23.  Lower escape wheel pivot / cap jewel
24.  Escapement inspection holes
25.  Lower pallet arbor pivot / hole jewel
26.  Lower balance pivot/ cap jewel
27.  Click
28.  Click spring
29.  Upper center wheel pivot / hole jewel
30.  Center wheel
31.  Balance cock
32.  Regulator
33.  Upper balance pivot / cap jewel
34.  Escapement inspection notch
35.  Hairspring stud
36.  Balance wheel
37.  Pallet bridge
38.  Hairspring
39.  Upper pallet arbor pivot / hole jewel
40.  Pallets
41.  Escape wheel
42.  Upper escape wheel pivot / cap jewel
43.  Forth wheel
44.  Hour wheel