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+====== Zenith 4052 ======
+Calibre **4052 B** (and the similar **4052 W**) is an [[automatic]] central-[[foudroyante]] [[chronograph]] movement from [[Zenith]]. Introduced in [[2010]], this was one of a series of modern movements expanding the classic [[Zenith El Primero calibres|El Primero movement family]].
+===== Overview =====
+Although the [[Zenith El Primero|El Primero]] operated at 36,000 A/h from the very start in [[1969]], no model allowed true 1/10 second [[chronograph]] precision. Zenith worked on various approaches to the problem and decided that a 1/10th [[foudroyante]] (one revolution per second) central seconds hand was the most straightforward. The outer scale on the dial is divided into 10 major sections, with each subdivided with 10 markers and a "0.5" in the center.
+Since the existing 60 seconds markers on the dial to not line up exactly with this new 100-marker scale, a novel approach was adopted to ensure the central seconds hand always lines up properly Rather than use the existing chronograph brake, a new 100-tooth gear stops the seconds hand, ensuring it always points at one of the 100 marks along the outer track.
+Another technological difference in Cal. 4052 is the power delivery. Rather than driving the chronograph from the seconds wheel as is typical, it is driven from the escapement wheel. This allows true 1/10 second precision. To avoid impacting [[isochronism]], the clutch is a single lightweight piece of silicon that remains continuously engaged.
+Cal. 4052 is a "B" El Primero movement, meaning that the date window is at 6 00 rather than the traditional and unconventional 4 30 placement of the classic El Primero movement.
+===== Variants =====
+  * [[Zenith 4052|Cal. 4052 B]] - The original "Striking 10th" movement for [[Zenith El Primero Striking 10th]]
+  * [[Zenith 4052|Cal. 4052 W]] - [[Open-worked]] movement made with titanium and including 334 components for [[Zenith El Primero Lightweight]]
+  * [[Zenith 4057|Cal. 4057 B]] - [[Flyback]] version for [[Zenith El Primero Stratos Flyback Striking 10th]]
+===== See Also =====
+  * [[Zenith El Primero]]
+  * [[Zenith El Primero calibres]]
+  * [[Zenith El Primero watches]]
+<WRAP ud ud_mov>
+**Description:**
+  * [[Self-winding]] movement, bi-directional [[central rotor]] winding
+  * [[Escapement]] Stone lever
+  * [[Yoke winding system]]
+  * [[Column wheel]] calibre
+  * 326 components
+**Functions:**
+  * [[Foudroyante]] [[chronograph]] 1/10 second hand, 60 second counter at 3 00, 60 minute counter at 6 00
+  * [[Small seconds]] at 9 00
+  * [[Quickset]] date at 6 00
+**Data:**
+  * 13¼ [[ligne]]s
+  * D 30.0 mm, H 6.6 mm
+  * 31 [[jewels]]
+  * 36,000 A/h
+  * Power reserve 50 hours
+**Production period:**
+  * [[2010]]-present
+</WRAP>
+{{tag>Movements Automatic_movements Chronograph_movements Automatic_chronograph_movements Column_wheel_chronograph_movements Foudroyante_chronograph_movements Zenith_calibres Zenith_El_Primero_calibres}}