After lunch yesterday, we went to the #HistoryOfScienceMuseum in #Oxford. It’s not very big but contains some really fascinating exhibits. It is right next to the #SheldonianTheatre and well worth a visit.
Yesterday, we went on a day trip to #Oxford by #train. No other means of powered transport was used as we #cycled to and from our local #RailwayStation.
Here is the #countryside zooming past the train window.
Die Seiten sind aktuell noch nicht perfekt aufeinanderliegend, weil pdfcrop unterschiedliche Ergebnisse lieferte. Für den heimischen Drucker funktionieren sie aber gut:
A couple of weeks ago, I posted an #animation of a point on a circle generating a #cycloid.
If you turn the curve "upside down", you get the #BrachistochroneCurve. This curve provides the shortest travel time starting from one cusp to any other point on the curve for a ball rolling under uniform #gravity. It is always faster than the straight-line travel time.
Imagine a circular wheel rolling, without skidding, on a flat, horizontal surface. The #locus of any given point on its #circumference is called a #cycloid. It is a #periodic#curve with #period over the #circle's circumference and has #cusps whenever the point is in contact with the surface (the two sides of the curve are tangentially vertical at that point).
I was on a walk the other day and came across a pile of #timber. I also happened to have my #camera with me and I liked the #GeometricPatterns and #Colours I saw.
Common Grass-Veneer (Agriphila tristella) https://commons.wikimedia.org/wiki/File:Common_Grass-Veneer_(Agriphila_tristella)_-_B%C3%A6rum,_Norway_2021-07-14_(02).jpg
Koksabukta in Bærum, Norway.
(Full resolution on Wikimedia: https://commons.wikimedia.org/wiki/File:Koksabukta_-_B%C3%A6rum,_Norway_2021-05-31_(01).jpg)
Diesmal ein Abenteuer für Raumzeit/Technophob, dem 1w6 Science-Fiction Setting um Techschmuggel auf Planeten und Stationen, auf denen technophobe Herrscher den Zugriff auf Technologie begrenzen: https://www.1w6.org/deutsch/technophob
The previous time I had been to Kew was over a quarter of a century ago. Some things have changed, like this #TreeTopWalk. It is about 18 m above the ground.