I'm no expert at surveying, but this might help you save some money if you need to do some very basic property line surveys. Amazon Links to products used in video: amzn.to/2XU8uO5
You are the first person that i have watched that actually made correct use of the mirror. I have that same compass and the mirror has always been a mystery of how to use it. So thank you very much for your good advice. i happen to know a good deal about surveying tools but that mirror has had me stumped for a long time. So now I can make a note of this and put it with the compass to use again at another time.
It's really interesting. But you should check the manual for the military M2 artillery compass. It basically the same except the M2 is in mils. The manual show you can use it in several ways. If you want to shoot an azimut using the mirror the same way as with a Suunto MC-2 for example, you need to use the south needle as your indicator of azimut.
If you get the mounting bracket that lets you mount that to a tripod, then that hole in the mirror will be like a plumb bob if you have to use a control point such as an existing surveyor's mark.
Interesting, I've never really known how people use these things. For this particular application, as long as you set the correct declination, any quality navigation compass (with a sighting mirror) would have done the trick, but by using a slightly different method.
The pocket transit is called a "transit" because it is legally considered one. The accuracy when operated with care should be within 1/2 degree. The easiest way to use it as a transit is to get one of the little tripods. That lifts it well up. You can then lay both the mirror and sighting arm out level with peep sights up vertical. With the transit level you can get very reasonable accuracy. Bruntons were developed for use in exploratory geology and prospecting, so their accuracy was important. One trick with the clinometer for quick slope measurements is to open the sight arm out straight of very slightly elevated. Find a target on the slope that looks to be about the same distance above the ground as your eye. Angle the mirror so holding it up, with the body tilted 90 degrees, you can see the clinometer and level reflected in the mirror, bubble up, scale down. Look through the sighting arm peep sight and the hole in the mirror and find your target. Holing your view there, adjust the clinometer until you see the bubble level in the mirror. Then read the slope off the scale. The Brunton design is very flexible. Mil scale versions were made for military use.
"The pocket transit is called a "transit" because it is legally considered one." Uhh... what? What do you mean 'legally considered one'... they are not recognized as acceptable forms of measurement to establish boundaries in most countries. The courts would toss your survey out faster then a turkey in november here in America. "The accuracy when operated with care should be within 1/2 degree." Try to avoid using fractions of a degree. Stick to minutes and seconds, it'll makes you sound less ignorant.
@@OnTheMountain In some states, you can conduct a "survey" with one, and if you do, your accuracy is your responsibility. You can be held accountable for errors made. If you are using a compass, there's no equivalent responsibility attached. The Brunton is considered accurate to 1/2 degree. A typical base plate compass like the Silva Ranger or the Suunto equivalent has a published accuracy within 2 degrees. Bruntons were developed to accomplish things like setting the corners of mine claims. Maping strikes and dips of ore bodies and similar tasks a mining engineer would undertake. So, when you find an historic claim marker in the desert, the claim description may very well have been developed with a Brunton. Things aren't quite so rough and ready these days, but using a pocket transit for a job will commit you to meeting higher expectations from the client and expose you potential liabilities. I've been there. These days, most people regard a pocket transit as just a glorified compass, but they are considerably more than that. There is a reason the Brunton is a pocket "transit" while a Silva Ranger that nominally gives you the same functions is a "compass."
I have one of these from my grandfather who passed, it appears to be very old, likely korean war era. the central needle doesn’t float or spin at all, just seized in place. does that essentially render it useless?
Laughed out loud at the tin foil hat comment! We have the pins set on our land but that tool would be helpful to find the lines as you said.Be well D2S family :)
