Junghans stop-clock timers

[Tom Kershaw]

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.

Junghans timer clock

 

[Nicholas Lindan]

Small hand is seconds, large is minutes. Look closely at the position of the hands - the large hand is ~3/4 the way between 16 & 17 minutes, the small is at 40 seconds. A better question is why does the minute dial have 0-100 markings along with the usual 0-60 markings.

 

[Tom Kershaw]

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.

 

[grahamp]

It allows the use of decimal minutes/seconds. Say 10 min * 1.25 gives 12.50 or 12 min 30 sec. Useful for calculations with electronic devices. My stopclocks all predate UK decimalization, so I don't have that issue

 

[BrianShaw]

metric minutes? I'm not sure.

From somewhere on the internet...

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.

There may also be a use in marine navigation...

 

[btaylor]

Oy, I bought a minutes rather than decimal time clock for work once- what a pain every time payroll came up!

 

[Tom Kershaw]

From somewhere on the internet...

Thanks for the linked text, and another article to read.

 

[Hilo]

Junghans timers are indestructible - I've had two hanging over my sink since the late seventies and have a third in a small darkroom at home for developing film. I tested them not long ago and all three ended up giving the exact time compared to my phone's stopwatch.

 

[pentaxuser]

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

 

[Alex Benjamin]

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 .

 

[Hilo]

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

I don't think, between the two clocks, there will be much difference when it comes to work with them.

It is important to have sufficient lighting over the sink.

I find the design of the clock Tom shows very beautiful. 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.

 

[Mr Flibble]

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.

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.

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

The one in the center

 

[Tom Kershaw]

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.

Very helpful, thanks. I put in an offer on eBay for the timer so will report on its operation when it gets here.

 

[Mr Flibble]

No problem Tom,

It should be alright. Otherwise the mechanism is easy to get to and service. Mine needed a light cleaning and miniscule oiling on some pivots/axels to get going properly.

 

[BrianShaw]

What kind of clockworks is in these; jeweled balancewheel escapement or no jewels?

 

[pentaxuser]

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

Yes, it was the size of the face to which I was referring. In Tom's picture the minute hand and dial is small whereas in yours the seconds and minute hand cover the same size dial. I'd want your clock in preference to the one shown by Tom


pentaxuser

 

[BrianShaw]

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 .

It is quite possible that you experienced a Freudian slip.

 

[Mr Flibble]

What kind of clockworks is in these; jeweled balancewheel escapement or no jewels?

No jewels in these as far as I could tell.

 

[Tom Kershaw]

The Junghans timer has arrived and is working. I'm planning to place it on a small additional shelf the the sink.