Definition:
The acronym A/H, which stands for “Alterations per Hour” or the phrase “Alternations per Hour,” is a term used in watchmaking to describe the frequency at which a mechanical watch oscillates. This measurement represents the number of times the oscillation of a specific component, such as the balance wheel, occurs in a period of one hour. Alterations per hour are a critical measure of the accuracy of a mechanical watch and are often used to assess the quality and performance of a movement.
Origin:
The origin of the term “Alterations per Hour” is intrinsically related to the development of mechanical watchmaking. This measurement became crucial as watchmakers sought to improve the precision of watches and measure the frequency of internal component oscillations.
Usage:
The term A/H is widely used in the watchmaking industry to communicate the oscillation frequency of a watch. The higher the A/H number, the more accurate the watch is expected to be. High-quality watches often have a high A/H count to ensure precision.
Examples:
An example of a watch with a high A/H count is the “Rolex Cosmograph Daytona,” which has a chronograph movement that oscillates at a frequency of 28,800 A/H, meaning its balance wheel oscillates 28,800 times per hour.
Synonyms:
While “A/H” is widely accepted as the abbreviation for “Alterations per Hour,” there are no direct synonyms for this specific measurement. However, other frequency measurements, such as “vibrations per hour” (VPH), may be used in similar contexts.
Related Terms:
Related terms include “watch movement,” “oscillation frequency,” “balance wheel,” and “watch complications,” as oscillation frequency is a crucial part in determining the accuracy of the watch.
Tips:
- When choosing a watch, consider the A/H count as an important factor for the watch’s accuracy.
- Watches with a higher A/H count tend to be more accurate but can also be more sensitive to shocks and impacts, which can affect their accuracy.
Fun Facts:
- High-end watches often have a very high A/H count, contributing to their remarkable precision.
- The accuracy of a mechanical watch is often measured in terms of the maximum deviation allowed per day, which is directly affected by the A/H count and other design factors.
