Dished Tank Head

Dave Nelson

I'm building a cad model of a UTLX type V tank car per the drawings found on
page 344 of the 1906 CBD. I have a question about the term "Dish" as it
relates to the tank head. I hope some of you guys can help define **an
aspect of the term** that I don't understand.

It is apparent to me that "dish" refers to some how far the metal has been
pressed so as to form the tank head - afterall, looking at the pressed steel
from the inside of the tankcar, it would look like a dish. My question is,
when the drawing says a 6" dish, that dimension is between two points. One
is obviously in reference to the furthest point out that the steel has been
pressed - but 6" from what relative to the anything else? And is that 6"
dish measured to the inside or outside of the head?

Looking at photos, what I see is the car end is a solid sheet of steel,
after being pressed into a dish, retains some distance of metal that slides
tightly into the tank, for use in riveting end to tank. That is to say,
extending beyond the dish itself is a steel cylinder, marginally more narrow
than the tank itself. A small portion of this inserted cylinder remains
exposed, just outside the end of the tank. This cylinder begins to curve
inwards, oh, on perhaps a 1 inch radius and then takes on the outlines of
the dish.

So. is the 6" dish relative to the end of the car, the end of the cylinder
where that 1" radius curve begins, or right where the dish form begins?

Yeah, I know. some of you HO scale guys are going "you gotta be kidding me,
right?". Nope. It's getting the model done correctly.

Can anyone help me out here? Ummm, I think I should also ask, anyone know
of where I might find a more complete drawing(s) for anything of this car?
I'm also wanting to do the X-3 design after this one.

Thanks in advance!

Dave Nelson

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