shown individually in fig1 and 14 but superimposed upon each in combination the action for the component of deflection about yy is identical to that of fig1 aa except to a lesser degree and the component of deflection about x x is 0 707 of that shown in fig1 this latter is pure rotation of the associated split pinion segments this supplementary rotation of the pinion is not quite ideal since it has been rocked into a slightly non circular form by the other component of the deflection however it has been found mathematically that in the case of 36 u00b0 total deflection u03b4 the worst consequence is the introduction of one thousandth of the joint 39 s outside radius as looseness during the rotation such degree of looseness is negligible as a practical consideration in view of necessary operating clearances one complete revolution of the universal joint 28 will now be described with reference to the drawings assuming a relative disposition of the drive shaft 24 and driven shaft 26 turned 45 u00b0 from their respective disposition illustrated in fig3 the pinion segment 38a and 38b will be engaged as shown in fig1 pinion segments 42a and 42b on the opposite side hidden will be rocked to the same degree but in the opposite direction pinion segments 40a and 40b and 44a and 44b on the opposite side and hidden will be disposed as shown in fig1 turning the shafts 90 u00b0 in a clockwise direction from fig1 and 14 will reverse the disposition of pinion segments from that illustrated in fig1 and 14 towards this end pinion segments 38a and 38b together with 42a and 42b will be disposed in the manner depicted by 40a 40b and 44a and 44b in fig1 pinion.