There are a lot of them on ebay.
It looks like a transit without circles but it's hard to tell exactly without better photos.
Incidentally, I don't know how over half the sellers on ebay expect to sell stuff for a good price with blurry photos and bad descriptions.
Not a term I've seen before. Searching it turns up some vague indications that it's a transit! But there are also suggestions that it is especially equipped for high-accuracy optical tooling.
Cheers,
Henry
Establishes precise vertical planes and plumb lines. When equipped with a right-angle eyepiece, zenith sights or upward plumb lines can be established. Two-speed tangent screws on both the azimuth and elevation axles ease leveling and auto-collimation. The instrument comes equiped with a standard Level Vial 71 3260 attached to the telescope and a circular vial on the plate. The eyepiece is easily converted in the field for auto-collimation. An all-purpose glass reticule with cross-pattern of single lines top and right, paired lines bottom and left is employed.
More here:
Click on "Learn" for an overview of metrology aka industrial measurement.
I believe Brunson would still put a jig transit together for you but laser trackers and software predominate in the aircraft industry and other applications.
I accompanied someone who used a couple of Brunson Jig Transits to align rollers in a paper mill. Plant was trying to do it with piano wire and industrial levels (high end torpedo levels) but could never get it quite right. If the rollers were too far out of alignment i.e. parallel to each other paper would go flying everywhere. This was paper 10 ft or more wide going at high speed. He successfully got them lined up. The Jig transit had been acquired as government surplus. I think the paper mill made him an offer he couldn't refuse and he sold them to the mill.
K&E also made Jig transits. Brunson acquired what was left of that business after Cubic ran it for awhile after buying it from Kratos who took over what was left of K&E.
Jig transit because they were and are used to check the large jigs and fixtures used to fabricate aircraft components.
Supply Guy is correct. Laser Trackers are quickly replacing Jig Transits.
Jig transits are used in optical tooling applications to establish horizontal lines or vertical planes, i.e., "line"
Split Bubble levels are then used to establish horizontal planes, i.e., "grade"
Wyte face scales are typically the target of choice.
Laser Trackers are not the best tool for measuring deflections when doing stress-testing of steel-reinforced concrete beams. Jig Transits with wedge micrometers and Wyteface scales are the way to go for hazzardous conditions - usually from behind sand bags ...
That's exactly what we did about 15 years ago at the University of New Orleans - nobody died when the beams reached catastrophic failure. Sure was a loud boom!
> Laser Trackers are not the best tool for measuring deflections when doing stress-testing of steel-reinforced concrete beams. Jig Transits with wedge micrometers and Wyteface scales are the way to go for hazzardous conditions - usually from behind sand bags ...
>
> That's exactly what we did about 15 years ago at the University of New Orleans - nobody died when the beams reached catastrophic failure. Sure was a loud boom!
Prof.
I believe a loud boom may be a massive understatement. The sound of steel breaking is not one you forget soon. The last time I heard it we were testing pipe welds to failure.
That was a much smaller piece of steel than a beam and much less pressure was involved.
SJ.
"... Laser Trackers are not the best tool for measuring deflections when doing stress-testing of steel-reinforced concrete beams. Jig Transits with wedge micrometers and Wyteface scales are the way to go for hazzardous conditions - usually from behind sand bags ...That's exactly what we did about 15 years ago at the University of New Orleans - nobody died when the beams reached catastrophic failure. Sure was a loud boom!..."
Laser Trackers can and have been used for the same purpose with much success, no deaths and no need to even put people in harm's way behind sand bags.
Why would anyone want manually recorded, manual readings in one dimension, when three dimensional, time stamped, remote controlled, laser tracker readings are possible?
Oh, by the way I have yet to use a jig transit with onboard statistical analysis, like a laser tracker.
I would add that any 3-D change in the surface of the beam where the wyte face scale is located would probably deflect in more than one X,Y,Z vector direction.
And, that the "one dimension" reading from the jig transit and wyte face scale reading would be misleading as the scale would likely tilt and skew as the beam changes shape under load.
Don't know...But I Saw a transit.........every day 🙂
