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Closed-End Air Columns (1852 words) |
 | In the case of stringed instruments (discussed earlier), standing wave patterns were drawn to depict the amount of movement of the string at various locations along its length. |
| In the case of air columns, a closed end in a column of air is analogous to the fixed end on a vibrating string. |
| That is, at the closed end of an air column, air is not free to undergo movement and thus is forced into assuming the nodal positions of the standing wave pattern. |
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Surgical instrument positioning system - Patent 5728047 (7464 words) |
| A surgical instrument is provided comprising an attachment portion and/or attachment means for adjustable attachment to the adjustment positions provided by the positioning means of the belt assembly to allow the instrument to be maintained in a desired position during a surgical procedure. |
| Instrument hook 60, in a preferred embodiment, is attachable to surgical instrument 50 and includes a self-locking ring member 62 and a tongue member 66 which fits within a slot 68 which is formed within end portion 69 of ring member 62. |
| Instrument hook 60 is preferably provided in two sizes, one with an inner diameter d.sub.3 of 3 to 5 mm and the other with an inner diameter of 10-12 mm, which allows the hook 60 to fit around typically used surgical instruments having distal handle diameters of corresponding sizes. |
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