It had been the cylinder in a V16 locomotive engine, and pulled because it was worn "out of round" and couldn't be machined back to usefulness. Anyhow, I saw on their scrap pile a very large steel cylinder liner - inside diameter about 12-14 inches, and about 2 feet long. The cylinders and pistons of the prime movers (engines) in some of the locomotives are designed to be replaced "in the field", rather than sending the whole works back to the manufacturer. I have a friend who works in the overhaul shop at one of the two national railroads that pass through my town. I did find an interesting inner steel container. I'll see if I can think out a clear way to present the "National Geographic" method, although to be honest old sets of encyclopaedias are as easy or easier to come by, and work well (just go to any independent bookseller - and take a wheelbarrow, LOL).
My current project is trying to build a Telecaster-pattern electric guitar using butcher-block style glued-up 2x2 short ends of maple - a gift from a cabinetmaker friend. Gosh, I h adn't even considered this as a worthwhile Instrructable. They demonstrate a variety of materials and techniques that can be used when making this kind of project. Here are other book container instructables (in order of views). You must have one unaltered book on each side of your compartment, but I recommend having two or three so that if someone is messing with books on the shelf and a few fall over, it doesn't reveal your hidden compartment. Get more books than you think that you will need.
#BOOKS WITH HIDDEN COMPARTMENTS FULL#
You can often get a whole bag full of books for just a few dollars. On the last day of these sales the remaining books are typically sold at a huge discount. Many public libraries will have a large book sale once a year. A good source for cheap books is community book sales. So it helps if the book are relatively uninteresting while still looking like something that you would have on your shelf. The secret compartment only remains a secret as long as no one tries to read any of the books. 3. Hardback books hold their shape better than paperbacks do after being cut up. Sets of reference books like encyclopedias work well because they are all the same and it is a reasonable excuse to have a bunch of large books all in one spot on the book shelf. The books do not need to be the same size, but it is convenient if they are. Since you are using multiple books, the thickness of each one doesn't matter.
The size of the cover is what limits storage space. The height and depth of the books are the important dimensions of the book. But here are some guidelines that may help. There is no specific kind of book that you need to use for this project.
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