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    Vertical Angle Measurement Errors
    From: Bruce J. Pennino
    Date: 2013 Mar 28, 08:14 -0700


    I've attached some angle data I've recorded with my theodolite. My goals are stated. I'm in the process of evaluating this information, and hope that others will look it over. I'll post my conclusions in a couple of days, and then we can discuss further. I've tried to give all pertinent information within the attachment.

    A very little about the data..... No data points were excluded and there are no apparent blunders. There are some outliers. The data was recorded very carefully by reading the angle, rereading, writing it down, recheck reading, recheck writing, and then going on to next point. It only takes maybe 1 minute per value, so it goes quickly once the instrument was set up. The device is an earlier total station which requires "eyeball" reading of an index....no digital output. The instrument calibration is extremely stable, but it has not been to a shop in 10 years. I check it frequently in various ways, especially against other work I do with another instrument; or on occasion against work done by a professional land surveyor I know who is an absolute fanatic about precision, accuracy,errors,etc.

    We are starting to learn a little. I hope to go next week and measure dip from a precisely known elevated position, Blue Hills Observatory outside Boston.


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