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Boudreaux Level for Measuring the Vertical Angle During Opacity Evaluations

You have to maintain a vertical angle of 18 degrees or less. The best way to measure the vertical angle is with a Boudreaux level. This is a homemade device you can make for about 4 bucks. Or I could make one and sell it to you for $25 bucks. Brought yourself down to the drugstore and pick up one of them protractors what they used in grade school. Get yourself some yarn and a nut. Find a drill and a small drill bit. Drill out that predrilled hole in the top flat side of the protractor. Drill it though and through. Tie that yarn into that hole you done drilled. Hold that protractor up with the flat level side up. Take some scissors and snip off that yarn about 2 or 3 inches below the round side of the protractor. Tie a nut from your tool box onto that yarn so the nut will hang from the hole you drilled down past the round end of the protractor.  Hold the protractor level with the flat top side up and the nut hanging past the round part of the protractor. Look at the angle where the yarn intersects. This should be level at 90 degrees. Ok, now take a ballpoint pen out and snap off both ends of the pen. Pull out the ink cartridge, be careful or your fingers will turn black. Now you should have a holler cylinder. This is your scope. Tape your ballpoint pen scope up level with the flat top of the protractor. Use some electric tape. When you finish making the Boudreaux Level, it should look like this.

Now scope in your observation point. Let the nut and the yarn swing towards you. Mark the angle where the yarn hits the protractor. The angle should be about 70 degrees. Subtract the marked angle form 90 degrees which is level. This will give you the vertical angle and it should be 18 degrees or less.

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