I would bet the gradient marked bobs are somehow used to measure depth of condensed water gathered at the bottom of the tank.  Used a long marked wooden stick to measure the amount of gasoline left in a tank at the gas stations I worked as a youngster but can't recall how we determined how much water was at the bottom.

Lufkin has always been 'really proud' of their stuff. Not saying that their tools are not worth it, they will last a long, long time

On October 16, 2016 at 9:33 AM, John Morris said:

Hey @John Moody, those tapes aint cheap! You made a good find! http://www.lufkintool.com/tapes/oil-gauging

 

I think I bought it for $10.00. Not to bad.

On 10/14/2016 at 3:02 PM, John Morris said:

Plumb Bobs!!!! Did I hear plumb bobs!!!!!!! I love plumb bobs!

Nice looking collection John, very nice indeed!

The plumb bob on the tape reel, can you explain that reel? Is it a steel tape? What measuring system or markings are used? And how long is it, looks like 25'?

 

Thou shall not covet thy neighbors bob...

 

 

 

Just now, Nickp said:

 

Thou shall not covet thy neighbors bob...

It's hard not too, it's in-bred into my DNA, Land Surveyor, Plumb Bobs, do you see the issue I have here?

1 minute ago, John Morris said:

It's hard not too, it's in-bred into my DNA, Land Surveyor, Plumb Bobs, do you see the issue I have here?

 

...and you didn't like math...?

 

Just now, Nickp said:

...and you didn't like math...?

Hated it, go figure right?