Part of the success of the Yolo reflector can be attributed to a simple but rigid test which is available for certifying the design of the warping harness. For this purpose, the mirror with its warping harness is set up as shown in Figure 4. The separation-distance, U, is given by the following expression:
where the angle, B, is expressed in radians.
Where R1 and R2 are equal and T is 1.2 times S, the following formula will hold:
The artificial star, in order to be suitable for this test, should be reasonably round, and its diameter, d, should be no greater than that given by Eq. (21):
Since this is smaller than the pin-hole light sources used by many telescope makers, optical reduction must be resorted to in order to adapt available equipment for this service. A microscope objective is recommended for this purpose.(4)
