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What is this thing, how is it used?

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  • What is this thing, how is it used?

    A friend of mine sent me this picture http://mysite.verizon.net/stockerwel...glevernier.jpg and asked me what the heck it was, how/why was/is it used, and in particular, how does the vernier work. I await your wisdom....
    ----------
    Try to make a living, not a killing. -- Utah Phillips
    Don't believe everything you know. -- Bumper sticker
    Everybody is ignorant, only on different subjects. -- Will Rogers
    There are lots of people who mistake their imagination for their memory. - Josh Billings
    Law of Logical Argument - Anything is possible if you don't know what you are talking about.
    Don't own anything you have to feed or paint. - Hood River Blackie

  • #2
    its for a big gun...the sort thats mounted on wheels

    its used for getting the angles set

    got one myself

    all the best..markj

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    • #3
      Also known as a Clinometer.

      Peter

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      • #4
        Still in use today

        Even on Machine guns....

        Often called a Gunners Quadrant..

        Here is some good info:

        http://browningmgs.com/Clinometer/Clinometer.htm

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        • #5
          ............................
          Last edited by Hal; 01-30-2008, 06:43 PM. Reason: guessed wrong.........................

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          • #6
            You guys are amazing.

            Any insight as to how the vernier works? It's +/- 25, which is +/- one notch on the angle...but how does sliding the vernier left or right adjust anything?
            ----------
            Try to make a living, not a killing. -- Utah Phillips
            Don't believe everything you know. -- Bumper sticker
            Everybody is ignorant, only on different subjects. -- Will Rogers
            There are lots of people who mistake their imagination for their memory. - Josh Billings
            Law of Logical Argument - Anything is possible if you don't know what you are talking about.
            Don't own anything you have to feed or paint. - Hood River Blackie

            Comment


            • #7
              Originally posted by SGW
              but how does sliding the vernier left or right adjust anything?
              'The level holder slides along the curved top surface of the radial arm'


              As it says in the link, the top of the radial arm is curved. And when the level is moved along this curve, the angle changes slightly.


              .
              Thomas

              Problems worthy of attack prove their worth by hitting back
              - Piet Hein

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              • #8
                Thanks - I missed that.
                ----------
                Try to make a living, not a killing. -- Utah Phillips
                Don't believe everything you know. -- Bumper sticker
                Everybody is ignorant, only on different subjects. -- Will Rogers
                There are lots of people who mistake their imagination for their memory. - Josh Billings
                Law of Logical Argument - Anything is possible if you don't know what you are talking about.
                Don't own anything you have to feed or paint. - Hood River Blackie

                Comment


                • #9
                  Is it safe to say it acts similar to a macninist vernior only for angles?
                  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                  Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                  It is true, there is nothing free about freedom, don't be so quick to give it away.

                  Comment


                  • #10
                    Sight

                    On mortars we used to set the angle and crank until the bubble was centered and level. It was then ready to fire. We were told we were expendable but that mortar sight was not.
                    Chuck

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                    • #11
                      Inclinometer

                      Originally posted by Bguns
                      Even on Machine guns....

                      Often called a Gunners Quadrant..

                      Here is some good info:

                      http://browningmgs.com/Clinometer/Clinometer.htm

                      Thanks Bguns.

                      A very interesting post.

                      The theory and application of "mil" as applied to the military applications are quite interesting.

                      See the following:
                      http://en.wikipedia.org/wiki/Angular_mil

                      A bit more info on the many uses and applications of inclinometers generally is at:
                      http://en.wikipedia.org/wiki/Inclinometer

                      And yes, I do have a back-ground in military (Naval) guns.

                      Surveying too.

                      Comment


                      • #12
                        That one's from some foreign army, here's a picture of the US version.


                        Joe

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                        • #13
                          Range setting

                          The inclinometers shown are calibrated in "mil" - as previously.

                          They are effectively an initial range-setting device.

                          Once the target distance (range) in known, the ballistics tables for the particular weapon and ammunition are consulted to find the gun elevation required in mil units.

                          That is the reason for the spirit level - to set the gun relative to a known zero/horizontal reference.

                          http://en.wikipedia.org/wiki/Angular_mil

                          Each gun has its own (in)clinometer which has been set up for/to/on that gun.

                          Once the gun starts firing the aimer uses his vision to determine corrections from the fall of shot for elevation (range) and deflection (left/right).

                          Unless the tribrach on which the gun rotates laterally is very well set up, any errors will negate the range elevation zero at any other bearing.

                          Needless to say, with all the crashing and banging about that the gun gets during firing, it pretty well cancels out further use of the inclinometer.

                          While, in theory, the mil units can be used to set range, the ballistics of the gun and ammunition will require further additional elevation (sometimes called "super-elevation" and other times called "tangent elevation") - as well as "drift".

                          But a good Gunner can estimate range, elevation and drift as can a good rifle-man and adjust accordingly.

                          Now-a-days, "tracer" rounds are included in clips of ammunition to indicate where the fall of shot is.

                          "Spotters" (people) are really excellent here.

                          I suspect that the clinometers would not have got a lot of use when "things got hot".

                          Comment


                          • #14
                            I was on active duty in the US Army for 3 years, Ordnamce Corps and for about 12 more years in the reserves. One of the 3 years of active duty was in Vietnam. Lots of guns of all sizes up to 6 inch/155mm. Frankly, I never saw one of those in use or even in storage. The smaller guns, as in those carried by one man, didn't need it. You aimed and fired or you sprayed with the machine guns. Snipers had scopes. The artillery guns had removable optical "sights" that were a lot more accurate than a gunner's quadrant. These were carefully carried in their own cases and never left on the gun when it was fired. These optical sights were used in conjunction with aiming stakes, not the targets which were completely out of sight.

                            I suspect they are a leftover from the 19th or earlier centuries. Can you say "Civil War"? Today I am sure the aiming technology involves computers and global positioning.
                            Paul A.
                            SE Texas

                            Make it fit.
                            You can't win and there is a penalty for trying!

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                            • #15
                              Until the late 1950's every artillery piece was supplied with one, a leftover from an earlier era, as you have said. I have never met an artillerist, of any era, that actually used one. Each gun had a flat machined on the breech end parallel with the bore, to place the quadrant on. Probably on the orders of some general that actually remembered using one, back when. The one in the picture has a 7 digit stock number, which makes it pre 1958. I've never seen one newer.

                              Joe

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