Modern Book Sizes Are Based on Sheep

Most printed books come in certain standard sizes which have been used for hundreds of years. Even the dimensions of Kindles and other eReaders are derived from these norms of printing. And where did these standards come from? According to medieval scholar Carl Pyrdum, they're based on the size of a sheep:

The question then becomes, I guess, why were medieval books the size they were? And the answer to that is simple: medieval books were the size they were because medieval sheep were the size they were. Remember, paper wasn't the original medium for page-creation. Medieval books were constructed of parchment, which is a fancy word for sheep or goat skin (and primarily sheep skin, because there were a lot more of them around).


The whole sheepskin, flattened out and folded in half, is one common size. Fold it again, and it's another size. All of these sizes and dimensions are still being used by printing houses in the 21st century. The Kindle, for example, is the size of a sheepskin folded over three times. Pyrdum provides further examples and concludes:

Next time you're squinting at your mass-market copy of Dan Brown's latest wishing the pages were just a smidge roomier, blame the medievals for not having bigger sheep.


Link via Wired | Photo by Flickr user David Masters used under Creative Commons license

Comments (9)

Newest 5
Newest 5 Comments

Completely untrue; Carl's wrong. The "common size" you're talking about is format-the number of times a sheet is folded to make one gathering. Folio is one fold (2 leaves, 4 pages), quarto is two folds (4 leaves, eight pages), and so one. But format does not determine the size of a book! The size of the paper sheet also matters, and sheet sizes have varied throughout time. The kindle is not a sheepskin folded over three times (which would be called an "octavo.") "Octavo" may mean something specific in contemporary book parlance, but it has absolutely nothing to do with medieval vellum.
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Sounds similar to the old legend of railroad tracks being related to Roman chariots.
http://www.straightdope.com/columns/read/2538/was-standard-railroad-gauge-48-determined-by-roman-chariot-ruts
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I suspect that "daylight saving time" has only been invented to promote the manufacturers of radio-controlled clocks...

I would prefer just to end this daylight saving folly all over the planet...
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Northern states like DST so they can play more golf, softball, and other diversions after work. Didn't the former Soviet Union use double daylight savings for a couple months in summer? I wonder if they still do in today's Russia and the former SSRs.
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I'm all for stopping the switch, but keep it on daylight savings time. Who needs the sun to come up at 5:30 in the morning? I'd much rather drive home from work before it gets dark.
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There is a popular myth in the UK that daylight saving time exists to aid scotish farmers. Obviously being in the north the winter days in Scotland are shorter than in England (or indeed Wales). The myth has it that changing the clocks gives the farmers more daylight in the morning. The myth misses two important things; firstly that farmers will when daylight is limitted work to the daylight, not the clock; and secondly that daylight saving works on summertime when there is plenty of daylight about, the clocks are "normal" in the winter.

Another version of the same myth claims that road accidents in Scotland are reduced by DST since it is lighter in the mornings in winter. Again this fails to work for two reasons; firstly in that the days are so short in the north of the country that the morning and evening rush hours happen in the dark in winter anyway; and secondly again the clocks are changed for summer not for winter.

Quite why these myths exist I don't know, but they do.
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@Jim Why not just keep the clocks as normal in summer and play golf before work?

My personal gripe is that DST messes with my surfing. Often depending on the swell and the state of the tide the best surf of the day might come before work. There are times of the year in spring and autumn when there isn't enough daylight in the morning to get in a session before work when there would be if we stayed on winter time all summer. What I want is a window before and after work so I can get more chance to benefit from the optimum swell/tide conditions to give the best surf.
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