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What (who) is fall through - definition

TECHNIQUE USED IN COTTON GINNING PROCESSING

Pull-through; Pull through

fall through

fail.

fall through

<programming> (The American misspelling "fall thru" is also common) 1. To exit a loop by exhaustion, i.e. by having fulfilled its exit condition rather than via a break or exception condition that exits from the middle of it. This usage appears to be *really* old, dating from the 1940s and 1950s. 2. To fail a test that would have passed control to a subroutine or some other distant portion of code. 3. In C, "fall-through" occurs when the flow of execution in a switch statement reaches a "case" label other than by jumping there from the switch header, passing a point where one would normally expect to find a "break". A trivial example: switch (colour) { case GREEN: do_green(); break; case PINK: do_pink(); /* FALL THROUGH */ case RED: do_red(); break; default: do_blue(); break; } The effect of the above code is to "do_green()" when colour is "GREEN", "do_red()" when colour is "RED", "do_blue()" on any other colour other than "PINK", and (and this is the important part) "do_pink()" __and then__ "do_red()" when colour is "PINK". Fall-through is considered harmful by some, though there are contexts (such as the coding of state machines) in which it is natural; it is generally considered good practice to include a comment highlighting the fall-through where one would normally expect a break. See also Duff's Device.

fall through

If an arrangement, plan, or deal falls through, it fails to happen.

They wanted to turn the estate into a private golf course and offered ?20 million, but the deal fell through.

PHRASAL VERB: V P

Wikipedia

Pullthrough

In cotton ginning, pull-through refers to a method of moving raw cotton in the cotton ginning process using only negative pressure or suction generated by powerful fans attached to the cotton cleaning machinery. This technique first came into wide use in the late 1980s in the United States. Samuel Jackson, Lummus, Consolidated, and other industry pioneers were early adopters of the technique.

Prior to the introduction of pull-through systems, the cotton conveying systems in gins required fan(s) at both the beginning of the line pushing the cotton and at the end of the line pulling the cotton through. These systems are known as "push pull systems".

Early experimentation with pull-through systems began by removing sources of high-pressure drop, such as tower dryers. This not only allowed for much higher air volumes, but it eliminated the need for the push fans, making use of more efficient and more powerful fans on the pull side only.

Pull-through layouts quickly increased in popularity because of the several performance advantages they offer. These advantages include that it permits enhanced machinery arrangements at the front end of the cotton ginning process, permits larger drying air volumes with greater horsepower efficiency, allows more forgiving division of cotton flow streams, and offers better cotton gin housekeeping due to natural evacuation of airborne dirt and lint from the building from the suction fans.

Today, a large majority of saw-type cotton gins worldwide use pull-through techniques in at least a portion, if not all of their pneumatic conveying and drying processes. Note that the term "pull through" is specific to the cotton ginning industry. Other industries may refer to the same thing as "negative pressure very dilute phase pneumatic conveyance".

Musicians memorializing the cotton ginning industry have shown a universal preference toward "pull through" over "negative pressure very dilute phase pneumatic conveyance", although there is universal engineering agreement that the latter term is both more articulate and accurate.

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

Examples of use of fall through

1. And what if your sale/purchase were to fall through?

2. Snow was predicted to fall through Thursday morning.

3. "We can expect other commercial deals to fall through, such as Shtokman," he said.

4. "Too many seniors would fall through the cracks with a voluntary savings system," he said.

5. Some organized rain and snow was to fall through the Four Corners Region.