What is the yellow thing on the side of this old K&E Transit?

That's the Homie Suspensium- Arkansas model......?ÿ?ÿ?ÿ?ÿ?ÿ 😉

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I dunno.?ÿ But from the general appearance (rust) I don't think I'd pay the shipping if the price of the item was free.

Is that a light adapted to the mirror hole?

I believe the 71-1010 was a "jig" transit specifically used for (as an example) shop fabrication of precise machinery such as airframes or even large lathes.?ÿ I believe (and it's about a 50/50 guess) the "yaller thang" on the side is a battery operated illuminator that aids in the sighting of an objective?ÿmirror through the instrument and focusing on the reflected cross-hairs to adjust for collimation error.?ÿ A part number for an older (120vac) illuminator was 71-5500.

I challenge anybody else to come up with anything better.?ÿ My explanation has a high s.w.a.g. factor.?ÿ

I too am very curious.?ÿ Been looking at Google, found another listing with better images.?ÿ But not yellow.?ÿ?ÿ

https://www.ebay.ca/itm/KEUFFEL-ESSER-CO-K-E-PARAGON-JIG-TRANSIT-9092-1A-WITH-WOODEN-BOX-/271347183686?_trksid=p2141725.m3641.l6368

It lists storage as "with accessories".?ÿ I am wondering if its a carrying case for calibrating tools, plumb bob, etc.

Posted by: paden cash

I believe the 71-1010 was a "jig" transit specifically used for (as an example) shop fabrication of precise machinery such as airframes or even large lathes.?ÿ I believe (and it's about a 50/50 guess) the "yaller thang" on the side is a battery operated illuminator that aids in the sighting of an objective?ÿmirror through the instrument and focusing on the reflected cross-hairs to adjust for collimation error.?ÿ A part number for an older (120vac) illuminator was 71-5500.

I challenge anybody else to come up with anything better.?ÿ My explanation has a high s.w.a.g. factor.?ÿ

yep, probably an illuminator