等截面（Prismatic）
如果一个物体（或物体的某一段）的横截面尺寸在某一指定方向上保持不变，则称该物体（或该段）为等截面的。
谐振器示例 —
- 如果圆柱形谐振器的直径在 螺柱轴线方向上保持不变，则它是等截面的。
- 如果无槽的条形变幅杆的宽度和厚度在 螺柱轴线方向上保持不变，则它是等截面的。（开槽变幅杆由于存在槽， 不可能是等截面的。）
- 如果圆盘的厚度沿半径保持不变，则它是等截面的。
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另见无型面变幅杆。
Prismatic
An object (or section of an object) is prismatic if its cross-sectional dimensions are constant in a specified direction.
Resonator examples —
- A cylindrical resonator is prismatic if its diameter is constant in the direction of the stud axis.
- An unslotted bar horn is prismatic if its width and thickness are constant in the direction of the stud axis. (Slotted horns cannot be prismatic because of the slots.)
- A disk is prismatic if its thickness is constant along the radius.
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Also see unshaped horn.