# Talk:Mengenlehreuhr

Latest comment: 26 days ago by Gah4 in topic At night

## English or German name?

Should this article be titled after the English (Set Theory Clock) or German (Mengenlehreuhr) name of the subject? – Fanatix 17:00, 9 September 2010 (UTC)

The article says that “the round yellow light on top blinks to denote even- (when lit) or odd-numbered (when unlit) seconds”, but other sources say the contrary. Why this disagreement? What does it mean when the lamp is on? 151.60.223.143 (talk) 22:41, 15 October 2012 (UTC)

To me, I'm even feeling odd about what is meant by "even" and "odd". Let's talk about the time between 1:23:45,0 up until (but not including) 1:23:46,0. Is this odd because the second's got the odd number 45? Or is it rather even, because it's the 46th second of that minute? -- Pemu (talk) 23:54, 4 August 2016 (UTC)
Digital clocks require a counter, even for digits not displayed. The light, then, would be the 1's bit of the seconds counter, either in binary or BCD. That doesn't mean that it has to be on or off, but tradition and the design of the rest of the clock, would be on when odd. Gah4 (talk) 12:23, 1 May 2024 (UTC)

## "Set theory principle"

I have removed the claim that time telling was based on the "set theory principle", which was either unclear to me or, in fact, wrong, to avoid reader confusion. See also the German article which contradicts it as well. 5mv2 (talk) 17:05, 2 December 2015 (UTC)

Contrary to this article, the german one even contradicts it explicitly: "Entgegen dem inoffiziellen Namen hat die Uhr nichts mit der Mengenlehre zu tun. Die Anzeige der Zeit erfolgt in einem Stellenwertsystem zur Basis 5.", which means "Contrary to the nonofficial name, the clock has no bearing on set theory. (Rather,) the time is displayed in a base-5 positional notation." (According to the german article, the official name is "Berlin-Uhr" (Berlin clock) and calls the term "Mengenlehreuhr" nonofficial.) (But the article gives no citation about this (neither about the official name nor about the "no bearing on"), therefore I state it here at talk, but not at this article.) -- Pemu (talk) 23:54, 4 August 2016 (UTC)

## At night

I took this picture in July 1975 at night, on High Speed Ektachrome film. If it would be a useful addition to the article, I would be happy to see it there.

. Gah4 (talk) 07:32, 2 May 2024 (UTC)