Chanson David

Comparative hour / divide

Bracelet strap
Pin buckle
Dial finish
Unblocked with Superluminova numbers
Water resistance
30 m
37.00 x 48.50 mm
11 mm
Self-winding mechanical
Power reserve: 40 h, 28800 variations / hours
Hours, Minutes, Seconds, Date
Decimal hours
CBN - 2.8
Launch date
Price incl. VAT
500 CHF

The International System of Units (abbreviated to SI) - based on the metric system - is the most widely used system of units in the world, namely the decimal system. It consists of seven base units (metre, kilogram, second, ampere, kelvin, mole, candela) and derived units. An important property of the latter is their consistency: they are all formed by a combination of base units, of which only the numerical factor 1 appears.

Example: 1 newton = 1 kilogram × 1 metre ÷ by 1 second squared.

The hour and the minute are SI-approved units of time measurement. However, they do not have a consistent relationship, their ratio being sexagesimal. For example, Charlie Chaplin's film-comedy "Modern Times", with a duration of 1 h 27 min, is actually 87 min long, not 127 min.

In order to make the system logical, i.e. consistent with the SI, I have created a new unit. Instead of dividing the day into 2 × 12 hours, I proposed to split it into 2 × 10 units, called "divide"* (decimal division).

As the replacement of the sexagesimal division by a decimal division of the time measurement requires a period of adaptation, I designed a comparative display with a double scale dial, representing the two types of time measurement.

The watch on the first page of my website shows 10:11:42 for the morning and 22:11:42 for the evening. On the outer part of the dial, the extension of the hour hand indicates the decimal division of the time measurement, i.e. 8.45 divides, for the morning, and 18.45 divides, for the evening.

The Comparative Watch** was born.



* trademark registered on 18 September 2002

** trademark registered on 30 October 2001