Thermic Syphons were funnel shaped tubes, that ran
down from the crown sheet in the firebox to the bottom
of the back tube sheet or the throat sheet (on boilers
with combustion chambers). They improved the
circulation of water and provided better heat transfer
Again, they raised the thermal efficency of the
boiler.
John D. Mitchell, Jr.
--- jonathanharris@e... wrote:
> Thanks to Charlie, Russ and John for your intresting
> and apt comments. I
> agree with John that much of what we are talking
> about is a matter of
> emphasis. And your point about exhaust steam
> injectors on the O-3s is well
> taken. I had wondered about these when I was poring
> over that 1935 list and
> suspected they must be something like what you
> descibe (I KNEW you knew
> more about this than I did ... Now, what the heck is
> a Nicholson Thermic
> Syphon?). I wonder how well these exhaust steam
> injectors worked -- they
> must have had the same problems with oil residue
> that the Worthingtons had.
> I guess my point about the O-3s still would be that
> all of that class
> equipped with only this more primitive technology
> (exhaust steam injectors)
> were assigned to the Lines East, while the O-3s on
> the Lines West all had
> more efficient, state-of-the-art FWHs. Of course, as
> Russ suggests, there
> may have been differences in the purchasing policies
> of management on the
> Lines East vs. West.
>
> About Russ's other point (grades on the FW&D), I
> don't know what to say.
> Most of what I know about such matters I've had to
> glean piecemeal from
> various sources, and about the FW&D, that's
> essentially zilch. I wish we
> had a comprehensive sourcebook showing track
> profiles or at least a list of
> ruling grades on the Q's various divisions and
> subdivisions. Corbin and
> Kerka give some such information, but only for a few
> sections of the
> railroad. And nothing for the C&S or FW&D. Maybe one
> of our Texas friends
> can help out. My folks lived in Dallas for about 20
> years. They moved there
> just as I was starting college, so I didn't spend a
> whole lot of time in
> Texas, but we did take some trips together and drove
> out west occasionally.
> I don't recall the country northwest of Ft Worth
> being very hilly, nor does
> it look to be in Steve Goen's pictorial. I don't
> doubt the FW&D had its bad
> stretches. But I wonder how they compared with, say,
> Angora Hill or the run
> up to Palmer Lake?
>
> Jonathan
>
>
>
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