Very soon after finishing my previous project I realized a need for this device.

What was happening was the front (and only) sight on the rifle was a bit lower than where my head is when firing the rifle so when I looked at it there was a subtle angle between where I was looking and where the actual barrel was pointing. At extreme short range this was not much of a problem but if I moved about 15-20 feet back (still quite short given the range of the rifle) I would have to aim the rifle about 8 inches lower than where I wanted my projectile to hit. (In my video on the other project I shoot at a section of palm tree with spraypaint. I hit the center with no issues but I had to point the sight at the bottom of the outside circle to hit the center)

Obviously I needed to do something about this since moving forward or backwards would affect the aim and while this is fine for archery, a rifle ought to be more consistent.

What I decided to do was to bounce my line of sight off of two mirrors so that in the end, I had, in effect, a horizontal line from the sight to my eye instead of the angled one.

This is all good and well but there's still the issue of looks . . .I couldn't simply slap a couple of mirrors on and call it quits so after getting the basics designed I made sure to do a couple of things to keep with the steampunk theme.

If you like this please rate and comment! If not, please let me know what you think I ought to do differently so that I can improve in future endeavors!''

Come with me now and I will show you how I made this and how you can use it to develop your own!

Step 1: Background and Theory

Before we jump right in I felt that some of you may benefit from some theory regarding mirrors since we'll be dealing so closely with them. If this is all old news to you then just skip this step.

Everyone knows what a mirror is and how it works and indeed it's common knowledge when it comes to a single flat pane of reflective glass. . .but when working with two mirrors and needing precision, a bit of physics will help immensely with design.

Our eyes work by receiving light and transmitting the information to our brains which interpret it. duh! The cool thing is that we can bounce this light off of certain types of surfaces and shiny or reflective ones work the best (again duh).

With flat mirrors perpendicular to a light source, the light reacts in an intuitive way: if comes in, bounces off the reflective surface and exits all in a straight line. At an angle, the light comes in and bounces out slightly differently, rather than exiting the way it came in it exits at an opposing angle (much like a ball bouncing on a flat court if we had no gravity). The convenient thing is that if we draw a line perpendicular to the mirror coming out of the point of impact (sounds cooler in my opinion) we can measure the angle between our line and the light's line. this angle is the same for the incoming and outgoing light! (see diagram). What's even better is, you can have light coming in and exiting at an infinite number of angles and following this rule all simultaneously.

This is why we're able to perceive objects as if they reside within the mirror.

The last convenient property we'll take advantage of is the fact that the reduction in intensity due to passing through the glass of the mirror and the imperfections of the reflective substrate is negligible. So we can bounce that light around as much as we want until the cows come home without worrying about dimming it.

So without further ado hop on over to the next step where we'll be using these properties to angle and place two mirrors.

*NOTE* the images for this step were lifted off of google since I lost my drawings and didn't have the heart to re-do them . . .
<p>The Springfield 1903 sniper scope was basically a telescope.</p>
i love it. very functional. however i spy a problem. unless you mark one of the mirrors, probably the bottom one for looks, you will be able to twist the point of aim all over those mirrors. say if you pointed your gun just a little to the left or right, your sight will still show up, but it won't be centered, and will shoot off. same is for up and down. what i would do is take the bottom mirror and paint a black ~v~ (like an rear iron sight) shape at the height of the front sight. this way, you can line up the horizontal and vertical axises. (if you plan to do this, when finding the height to paint, take into acount the angle of the mirror. see picture.)<br><br>a more adventerous (and somewhat unrelated) idea is to mount the bottom mirror on an adjustable frame, so that you could turn a screw and lift the mirror higher. this would give you elevation control, and allow you to aim further.
Excellent idea! so far i've been making sure the barrel is aligned with the sight but that's iffy at best. Definitely will make that mod!
id totally use this... if i wasn't making a minigun accuracy's not that important when youre spraying a wave of metal..
does this really work?<br />
yes this is fully functional<br />
Once again, an awesome build! I never would've thought to make a periscope for a rifle. Kudos on a novel and artistic solution.
thanks man!
i wouldn't use it .. i cherish my lego to much (it my only outlet of crativity ...and anger)
Ingenious use of lego... And i have so much of that kind of lego technic. I'm going to have to get spray-painting my lego :P
heh glad to be an inspiration
OMFG you Used lego in it Who da thunk it
lol yup! those gears fit together really well so I figured I'd repurpose them
Very nice we need some more steampunk things on instructables.
thanks!! yes we definitely need more
Your skill amazes me.
well my hobby is ceramics which requires a lot of working with my hands so they get lotsa practice. XD thanks!
It needs a fake axel or something.
thanks for the comment . . .where do you think would be good?
The gears don't seem to actually be connected to the mirror in any meaningful way. I think the gears should extend onto the axel the mirror pivots on.
good point! I'll see what I've got lying around
uh yeah...excellent use of lego here. Paint is convincing
thanks! the black base coat and a light touch of rub n buff makes the paint easy!
Keep it coming! great mod to your project. Im looking forward to your next one.

About This Instructable




Bio: I am a recent recipient of a BS in Computer Science. Currently working for an eDiscovery company as a web repository technician (hosting, searching and ... More »
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