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See the original Fanfold Bookbinding Idea (linked) which leads up to this one.
The original Idea talks about using half-thick paper and then gluing half the fanfold together, to imitate a normal book. That's a lot of glue!
Anyway, this new Idea is about using normal-thick paper. Also, one whole
book is printed on one side, and another whole book is printed on the other side. There used to be a type of paperback book called an "Ace Double" that had two shortish novels in it, printed in opposite directions. That is, one cover looks normal, but if you turn the book to see the back cover, you have to also turn it upside down. Both novels end at some middle page of the book. See link.
As with the original Idea, printing on a continuous sheet simplifies page-layout stuff for the printing process (no need to print alternate pages on the back side of the paper). Any difference in page count, of the two books, can be adjusted by a word processor (just increase or decrease font size of one book a trifle) before committing it to the presses.
The new thing here involves the covers. Each cover is solidly glued to the first and last "face" of the fanfolded stack of paper. Also, each cover is larger than the paper-face, and I'll use this ASCII sketch in my explanation:
| . . . |
| . . . |
| . . . |
I'm trying to portray the face of one cover (OK, so it has a bunch of dots on it, no big deal). If this was an ordinary book, the spine might be at the left and the side you open up to read the pages would be at the right. For a paperback book, the cover is the same size as the paper pages; for a hardback book, the cover is usually a bit larger than the paper pages.
In this book we want the left and right sides to extend at least a couple centimeters from the page size. And we want the cover material to be a little flexible, so that we can bend the edge that sticks out from the front cover toward the edge that sticks out from the back cover.
BOTH the left side and the right side of both the front cover and the back cover have a snap-together hinge arrangement. Both hinges are snapped together at the factory, prior to shipping the book to the stores. To read the book, one hinge is unsnapped, and the other hinge acts as a spine. The user can re-snap that hinge, and unsnap the other hinge, to read the second book.
The original Idea, as mentioned in the main text. [Vernon, Oct 12 2010]
Ace doubles are described here, although not in much more detail. [Vernon, Oct 12 2010]
One example of a snap-hinge
We don't really want metal hinges; plasic should work. Note that because the book is fanfolded, it can be opened and twisted in a way that should make it easy to snap the hinge components together. [Vernon, Oct 12 2010]
The flat part at the middle level of this sawhorse has a multisnap hinge. [Vernon, Oct 13 2010]
A design not too different from this could attach to the front and back covers of the book, and meet/snap at the middle of the spine, without the covers needing to stick out. [Vernon, Oct 13 2010]
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||[+] for the hinges, though reading the resulting tome anywhere but on a flat surface away from wind movement is definitely contraindicated
||Wouldn't it benefit the reader to prevent accidently
snapping open both hinges?
||[FlyingToaster], when you hold a book in both hands, usually the hands are holding the pages open and toward the covers. Wind and flat-surface should not be required, unless the distance from edge of the cover to the pages you would normally hold is uncomfortably far. One could fix that by either holding the book at the bottom edges or by using a different hinge design that doesn't need the covers to stick out and bend (the part of the hinge that gets mounted has a 90-degree bend in it).
||[Boomershine], some hinge designs have multiple snaps.
||thing is the spine(s) are attached only to the outside pages, not the middle ones, so if you turn it upside down the fanfold will come flapping out... no ?
||[FlyingToaster], do you regularly hold opened books by their covers only, upside down? I think you usually have your thumbs on the pages. In which case the fanfold is not such a problem. Yes, it CAN come out like you said. And there might be a small learning-how-to-handle-it curve, to reduce accidents. Still, if you are holding such a book open with both hands, and the fanfold falls out, it will land on YOU, meaning your body is blocking it from getting all over the floor and worse. Putting the paper back into the book should not be difficult.
||so not for one-handed reading, or for reading outside, and not a thick book since there's no attached spine to support a curve; quantum ergo ipso frodo a book that is read inside, away from humorously placed table fans... with that in mind I'll take mine with two or three leather straps on each side, latching from one cover to the other, in place of hinge/spines.
||I rather like the idea of greater tactility, ie: thicker pages for turning, without needing a thicker book.