Relativity on Rotated Graph Paper (a graphical motivation)

(based mostly on https://www.physicsforums.com/threads/teaching-sr-without-simultaneity.1011051/post-6588952 and https://physics.stackexchange.com/a/689291/148184 )

Within the penultimate draft, I had a non-algebraic motivating argument (which additionally motivates time dilation and size contraction)
that needed to be unnoticed as a result of the article was already too lengthy.

This argument now seems in Introducing relativity on rotated graph paper (Ch 7), my contribution to a just lately printed e book: Instructing Einsteinian Physics in Faculties
Kersting and Blair, Routledge 2021, https://doi.org/10.4324/9781003161721
(has supplementary materials on the backside: https://www.routledge.com/Instructing-Einsteinian-Physics-in-Faculties-An-Important-Information-for-Academics/Kersting-Blair/p/e book/9781003161721 )

The storyline… ranging from Einstein’s rules

The storyline goes like this:

• The Pace of Gentle Precept and Bob’s Velocity offers the form of shifting observer Bob’s light-clock diamond (with edges parallel to the sunshine cone, to the rotated graph paper).
  • development:
    Draw Bob’s worldline.
    Bob’s diamonds can have a diagonal alongside Bob’s worldline and edges parallel to the rotated grid.
    The scale of the diamonds corresponds to the spacing of the mirror worldlines, equidistant from and parallel to Bob’s worldline.
    However what determines the scale of the clock diamonds? (What occasion F on Bob’s worldline marks the signal-reflections?)
    

• The Relativity Precept determines the measurement (the scaling) of Bob’s light-clock diamond.
  (That is what I name the “Calibration Downside”.)
• SIGNAL-EXCHANGE EXPERIMENT: Two inertial observers meet at an occasion O.
  2 seconds after they meet, they ship a sign to the opposite.
  We count on they’ve the identical outcomes, in accord with the relativity precept.
  (I may have chosen “1 sec”… however the diagram is extra cluttered.)

An instance: the  ##v=(3/5)c## case

• Take ##v=(3/5)c## for simplicity.
  The makes an attempt:

  [* possible analysis: Since the round-trips are equal in both of the previous cases, we might
  expect the geometric mean ##sqrt{(3.2)(5)}=4## to be the expected result of their signal-exchange experiment.]

Do this for ##v=(4/5)c##.

Play with these utilizing
https://www.geogebra.org/m/HYD7hB9v#materials/UBXdQaz4 (make sure that BOB’s diamonds are proven)
https://www.geogebra.org/m/kvfsq664 (up to date)… (make sure that BOB’s diamonds are proven)
[You can manually adjust Bob’s velocity and “lengths [in the lab frame]” of the sunshine clocks.]

To acquire the textbook system relating the time-dilation elements and relative velocity, we might to proceed alongside the strains of my AJP article.

However the level is that we are able to present (with a geometric development and with out algebra) how the Relativity Precept and the Pace of Gentle Precept suggest the incompatibilities with Absolute Time and Absolute House, and counsel the necessity for the time-dilation and length-contraction results (as side-effects), on the best way to establishing the equality of light-clock diamond areas (which is basically the invariance of the sq. interval).

Additional studying:

Relativity on Rotated Graph Paper 
Be taught About Relativity on Rotated Graph Paper
Be taught About Spacetime Diagrams of Gentle Clocks