A better question is why does the minute dial have 0-100 markings along with the usual 0-60 markings.
metric minutes? I'm not sure.
Decimal hours
Another common type of decimal time is decimal hours. In 1896, Henri de Sarrauton of the Oran Geographical Society proposed dividing the 24 hours of the day each into 100 decimal minutes, and each minute into 100 decimal seconds.[18] Although endorsed by the Bureau des Longitudes, this proposal failed, but using decimal fractions of an hour to represent the time of day instead of minutes has become common.
Decimal hours are frequently used in accounting for payrolls and hourly billing. Time clocks typically record the time of day in tenths or hundredths of an hour. For instance, 08:30 would be recorded as 08.50. This is intended to make accounting easier by eliminating the need to convert between minutes and hours.
For aviation purposes, where it is common to add times in an already complicated environment, time tracking is simplified by recording decimal fractions of hours. For instance, instead of adding 1:36 to 2:36, getting 3:72 and converting it to 4:12, one would add 1.6 to 2.6 and get 4.2 hours.
From somewhere on the internet...
It has always appeared to me that the clock shown by Hilo is far more practical than that used by Tom, the OP, to ask his question. It looks much easier to use in terms of seeing and readíng it under safelight conditions
pentaxuser
This may be a daft question but I assume in the type of timer I've linked to, the large hand counts the minutes and the small interior dial counts seconds? However the largest dial on the outer parameter of the clock face is in seconds.
1/100 minute (or decimal) stopwatches were mainly used in industry. In industrial area, minute are divided into 100 units. Time measurements are easier to analyse, compare or convert into key performence indicators than classical minutes and seconds measurements. Mathematical operations are faster to calculate
Recently restored one of the very same models and it is the large hand that counts the seconds and the smaller hand counts the minutes.
The dial has an additional 100-seconds-per-minute scale for scientific/laboratory work, something to do with making timing of chemical reactions easier as I recall.
What is most important is the large size of these darkroom clocks. So you can see from a relative distance where you're at.
Attached another picture of my 'standing' clock, showing both hands. Each one is relevant: the white one for the overall minutes, the yellow one to understand when the moment to act is coming up.
View attachment 366086
Totally unrelated to the actual subject, but looking at the title too fast I actually read "Jungian stop-clock timers".
Maybe it's what Jungian psychotherapists use to tell when their patient's session time has expired.
What kind of clockworks is in these; jeweled balancewheel escapement or no jewels?
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