The Deadbeat Escapement: How Clocks Learned to Step
Before the early 18th century, clock pendulums utilized the anchor escapement. While revolutionary, the anchor produced “recoil”—every time a pallet engaged the escape wheel, it forced the wheel train to turn backwards slightly, degrading timekeeping accuracy to several minutes per week.
In 1715, British horologists Richard Townley and George Graham perfected the deadbeat escapement. By shaping the pallet faces as concentric circles around the arbor pivot, the escape wheel stopped “dead” during pendulum overtravel without any recoil. For the first time in human history, astronomical clocks ticked forward in exact, discrete one-second jumps, creating the familiar cadence of astronomical regulators and railway chronometers.
How Modern Computers Measure Sub-Second Time
Your computer or smartphone does not measure time using mechanical balance springs. Instead, an onboard quartz crystal oscillator generates millions of oscillations per second. Operating systems calibrate this local oscillator against Stratum 1 Network Time Protocol (NTP) servers worldwide, which receive time signals directly from cesium fountain atomic clocks and GPS satellites.
This webpage harnesses the browser's requestAnimationFrame API to calculate the second-hand vector up to 120 times every second. Rather than lagging behind or dropping frames, each frame renders the exact millisecond offset retrieved from high-resolution monotonic timestamps.
Frequently Asked Questions
Is sweep mode or tick mode more accurate?↓
Both modes reference the exact same system clock timestamp down to the millisecond. The only difference is visual interpolation: sweep calculates the exact trigonometric fraction for each frame, while tick snaps discretely at integer seconds with a mechanical deceleration curve.
Why does the second hand have a slight bounce in tick mode?↓
In physical mechanical clocks, when the pallet stone drops onto the tooth of the escape wheel, the inertia of the steel second hand causes a micro-vibration before settling against the jewel face. Our tick algorithm accurately emulates this physical mechanical inertia.