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Billiards Digest August, 2011 "Aim, Align, Sight -Part III: Sighting" ILLUSTRATED PRINCIPLES

Summary: Billiards Digest August, 2011
"Aim, Align, Sight - Part III: Sighting" ILLUSTRATED PRINCIPLES
David Alciatore, PhD ("Dr. Dave")
Supporting narrated video (NV) demonstrations, high-speed video (HSV) clips, and technical proofs (TP),
and all of my past articles, can be accessed and viewed online at billiards.colostate.edu. The reference
numbers used in my articles will help you locate the resources on the website. If you have a slow or
inconvenient Internet connection, you might want to view the resources from a CD-ROM or DVD. Details
can be found online at: dr-dave-billiards.com.
This is my third article in a series dealing with the important topics of aiming, alignment, and sighting. In
the last two months, we focused on aiming concepts and visual alignment issues. This month, we'll
investigate sighting, which concerns where you should align your vision and focus to best visualize and
achieve the desired aiming line for different types of shots.
Last month, I introduced the concept of "vision center" to describe the head and eye alignment, relative to
the cue, that allows you to see a center-ball, straight-in shot as straight, with the tip appearing to be at the
center of the cue ball (CB). The implication was you always want your vision center to be over the cue with a
center-ball hit. This makes sense for a straight-in shot, but it might not be the best approach for all people
and all shots.
Diagram 1 illustrates various options for sighting a pool shot. In Diagram 1a, the vision center (VC) is
aligned along the cue, through the CB center to the center of the required ghost-ball (GB) position. This is the
most conventional sighting method and seems to make the most sense. It is certainly the only reasonable


Source: Alciatore, David G. - Department of Mechanical Engineering, Colorado State University


Collections: Engineering