"Shrunkfitted on Tapering Threads"

Threaded galvanized pipe has tapering threads,

Oh. I interpreted the word "thread" literally and thought they meant some sort of welded metallic thread Thank you very much!

I have thermal shrunk threaded connections. Just heat up the fitting and cool down the pipe thread. When assembled and the unit reaches ambient it forms together.

so what is your definition of shrinkfitting? does it include liquid nitrogen or heat?

Somebody flipped the picture over--those are left-handed threads.

Look at the pic from the other side.

Those are Australian threads.

Everything turns the other way in the Southern Hemisphere.

Those poor guys on the equator are sure screwed, or unscrewed, or something.

https://en.wikipedia.org/wiki/Threaded_pipe

Tapered threads are the most common type of thread available. As the name implies, they have a slight taper. When mated together and tightened, the threads compress and may form a seal. Usually a thread sealant is required. The mating threads both hold the fitting in place and seal the connection.

But I see you understand now!

Interesting things!

This. Thank you!

http://www.mnhs.org/preserve/conservation/reports/timecapsule.pdf

If the tapered core is pre-cooled and the threaded on cap is pre-heated, you can rapidly tighten the cap onto the core and as they reach the same temperature the seal will become tighter.

Of course, this is not 1930 anymore and you can use a curing silicone to seal the space and it will be good for 100 years, as long as the metals are chosen to not corrode

But shrinkfitting is still used in some applications.

In some food packaging applications, the mold for a cap is made from several components, a core of 'copper' with a sleeve of 'steel.' to assemble the mold insert, the copper is cooled down with a cryogenic liquid and then pressed into place in the steel sleeve. Once the assembly has achieved room temperature, the pieced are mated together so tight they are effectively a single piece for molding purposes; if the mold is overfilled/overpressurized, the plastic will squeeze out between the molding plates before it tries to get between the copper and steel.

This may mean like pipe threads, which are tapered at a slope of 1/16, iirc.

This is interesting to read, for many reasons.

The book of record of the time capsule - Internet Archive

Such as: "We fly faster, higher, and farther than the birds. On steel rails we rush safely, behind giant horses of metal and fire.

Ships large as palaces thrum across our seas.

Our roads are alive with self-propelling conveyances so complex the most powerful prince could not have owned one a generation ago."

The description to which VictoriaJuhl refers:

"The Time Capsule is seven feet, six inches in length, and eight and three-eighths inches in diameter.

Its Cupaloy shell consists of seven cast segments, all segments except the last solidly screwed together, sealed with molten asphalt, and burnished.

The last section, closed after the placing of the contents in the Capsule, is shrunk- fitted on tapering threads."

That's the one :)
The Westinghouse capsule (or the Cupaloy capsule, or the New York World's Fair 1939 capsule, or the Flushing Meadow capsule *air* if you prefer) is meant to be retrieved in the year 6939 AD. The silicon may last for a hundred years, but 5000? Not that I believe the materials within the capsule will last either..

Btw, thanks all for your input!