Here's a simple way to measure the "equal angle" (which you'll have to adjust for the effects of cloth friction):
In your diagram the OB looks like it will have to hit somewhere around 1 diamond past the side pocket. Estimate where 2 diamonds (2 x 1 diamond) past the opposite corner pocket would be (out in space past the end of the table - use your cue as a measuring stick) and sight from that to the diamond by the side pocket - this is an "equal angle track" to your target corner pocket. The OB probably won't lie exactly on that track, but will be close enough to estimate its own track on a (nearly) parallel line.
pj
chgo
P.S. This is just another version of the "mirror" system or some "spot on the wall" systems, and they all must be adjusted for the effect of cloth friction. For OBs close to the rail the adjustment is usually to aim a little long (because rail friction will shorten the angle). For OBs farther from the rail that aren't hit very hard, the adjustment is usually to aim a little short (because forward roll will widen the angle). Both of these adjustments are smaller for steeper angles and larger for wider angles.
In your diagram the OB looks like it will have to hit somewhere around 1 diamond past the side pocket. Estimate where 2 diamonds (2 x 1 diamond) past the opposite corner pocket would be (out in space past the end of the table - use your cue as a measuring stick) and sight from that to the diamond by the side pocket - this is an "equal angle track" to your target corner pocket. The OB probably won't lie exactly on that track, but will be close enough to estimate its own track on a (nearly) parallel line.
pj
chgo
P.S. This is just another version of the "mirror" system or some "spot on the wall" systems, and they all must be adjusted for the effect of cloth friction. For OBs close to the rail the adjustment is usually to aim a little long (because rail friction will shorten the angle). For OBs farther from the rail that aren't hit very hard, the adjustment is usually to aim a little short (because forward roll will widen the angle). Both of these adjustments are smaller for steeper angles and larger for wider angles.
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