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Friday, 03 September 2010 17:34

How Sheep Determined the Size of Your Gadgets

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Kindle DX Promotional Photo from Amazon.com

It’s easy to figure out why e-readers and tablets are the size that they are: They’re all

about the size of paperback books, whether trade (iPad) or mass-market (the Kindle 3). Some oversized models, like the Kindle DX, are closer to big hardcovers. But why are books the size that they are? It turns out it’s because of sheep. Sheepskin, to be exact.

Carl Pyrdum, who writes the blog Get Medieval while he finishes his PhD in Literature at Yale, has the skinny on book sizes. You see, before Europeans learned how to make paper from the Arabs (who’d learned it from the Chinese), books were made from parchment, which was usually made from sheepskin. Sometimes, they’d use calfskin, too; if it was really primo stuff, it was called vellum. Like reading a whole book made out of veal.

We eventually mostly gave up on parchment, because it was expensive, and hard to work with. (There’s a reason medieval monks wrote manuscripts; preparing the parchment was penance.) But all of today’s book sizes (and by proxy, most of our gadget sizes) were established in the Middle Ages, and printers and papermakers carried them over. Booksellers and publishers still use these terms today:

  • Fold a sheet of parchment once (two leaves/four pages per sheet) for a folio; if you fold sheets of paper once without a cover, you’ve got a tabloid.
  • Twice for a quarto (8pp/s), the size of a big dictionary or big laptop;
  • Three times for an octavo (16pp/s), a hardcover or Kindle DX;
  • Four times for a duodecimo (24 pp/s), a trade paperback/iPad
  • Four times (a slightly different way) for a 16mo (yes, they gave up), aka mass-market paperback/e-reader;
  • Five times for a 32mo, aka notepad/old-school smartphone sized
  • Six times for a 64mo, or as Erasmus called it, a Codex Nano.

All images via Get Medieval.

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Authors: Tim Carmody

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