When calculating, only function of the longitudinal generating curve of the revoluted curved surface and the value of the projectingangle are needed to be substituted into these formulas.
这些公式的运用很简便，只常将回转曲面的纵母线函数及投射角的值代入即可。
2
The projecting beam angle can be manually adjusted using a screwdriver, and the adjustable power setting reduces hot spots and washouts.