Chronometer for indicating fertility days for cattle

摘要

The chronometer includes a time element (2) in which the small hand (5) in twenty one days covers the twelfth part of a revolution, which is equal to 30 deg.The time element also drives a second hand (6), which runs continuously with a second pulse. The time element (2) is operated mechanically or electronically and the large and small hands (4,5) are made of iron or steel sheet.