[PSUBS-MAILIST] measuring an angle issue

[Cliff Redus via Personal_Submersibles]

 If it were me I would just calculate based on trig.  Before you bore out to 12" measure the depth difference between the inside and out side edges of the seat and call this a.  Measure the inside and outside diameters before boring and designate b as the difference in diameters /2.  Angle would be arctan (a/b).
Cliff
    On Wednesday, June 26, 2019, 10:57:18 AM CDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi All,  I am planing to remove my original conical port and instal a dome on the original conical seat and bore the centre out of the original seat to get 12 inches of open view.  Will Cohen is making the dome for me.  My problem is, I have to measure the seat angle to within 1\4 of 1 degree.  How can I measure this angle without buying an expensive digital protractor?  I thought about just measuring the distances of the angles and just do the math, but it is pretty tricky to measure.Hank_______________________________________________
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