The Incredible Expandable Book

Like most objects, books are confined to the space they occupy, obedient as they are to the laws of nature. That is to say, unlike the Incredible Hulk, they do not normally expand beyond the limits of their own physicality. This post will challenge your beliefs if you agree with this statement. It draws attention to types of medieval books that do expand beyond their physical limits: with a flick of the finger or a gesture of the hand the dimensions of these special objects increased dramatically, up to ten times their original size. As if defying the laws of nature, this miraculous expansion increased the available writing space in objects that were principally designed to be small and portable. The examples in this post suggest that this given of “doing more with less” was an important drive behind the clever design of expandable books.

1. The folding almanac

London, Wellcome Library, MS 8932 (15th century)
Fig. 1a – London, Wellcome Library, MS 8932 (15th century) – Source
London, Wellcome Library, MS 8932 (15th century)
Fig. 1b – London, Wellcome Library, MS 8932 (15th century) – Source

If you are a frequent reader of this blog, you are no stranger to small books made for portability. The same goes for the almanac seen in Fig. 1. Produced in England in 1415-1420, it contains a calendar as well as astrological tables and diagrams. The information was used by physicians to diagnose and prognosticate, while the calendar provided information about feasts. Most of these almanacs, some thirty of which survive, look more scruffy than the pretty specimen in the Wellcome Library, which may not have seen much practical use (more here).

London, Royal Society, MS 45 (c. 1400)
Fig. 2 – London, Royal Society, MS 45 (c. 1400) – Source

Folding almanacs were especially popular in late-medieval England, assuming surviving specimens form an accurate representation. The objects are particularly interesting from a material point of view. During production the folding almanacs looked very much like a regular book: the scribe filled regular pages with text. However, in a completed state, when the binding was added, the pages were folded in a very clever way, giving the object an “unbookish” look. The precise manner of folding differed, as Figs. 1-2 show. Both fold in three steps, but the folding sequence is different. The leaves ‘sit’ different too. The specimen in Fig. 2 seems more prone to damage than the other almanac, because the expanding part (the four zones that are slightly lighter) are attached to the actual book by means of a delicate hinge.

2. The accordion book

Copenhagen, Royal Library, MS NKS_901 (dated 1513)
Fig. 3 – Copenhagen, Royal Library, MS NKS_901 (dated 1513) – Source

Both almanacs above provide six times more writing/reading space in their expanded form, which is quite amazing. However, this is still considerably less than another type of expandable manuscript: the accordion book. Fig. 3 shows illustrated specimen (a calendar) made in Denmark in 1513. While in its folded state the object is as small as a matchbox, it expands to a full page of considerable proportions, comparable to a regular-sized medieval book (more information here, facsimile here). Curiously, the calendar has a most unusual way of unfolding: sections of the sheet expand independently, like little flaps from a pop-up book (note the “incisions” on the right half of the object, as seen in Fig. 4 – full image here).

Copenhagen, Royal Library, NKS 901
Fig. 4 – Copenhagen, Royal Library, NKS 901, detail – Source

The Copenhagen accordion book is a very small portable object. Even though in its expanded state it became much larger, due to the limited size of the object in its folded state, the expansion produced a relatively small writing/reading surface. The remarkable thing about accordion books, however, is that their surface space could be considerable, even when the actual object (in its folded state) was still of modest proportions. My own Leiden University Library owns a copy from fourteenth-century Russia which is only 120 mm in height. The whole thing resembles the dimensions of an iPhone (Fig. 5). In expanded state, however, the book becomes no less than 3750 mm wide, meaning that the surface actually increases by an astonishing factor of ten.

Leiden, University Library, SCA 38 B (14th century)
Fig. 5 – Leiden, University Library, SCA 38 B (14th century) – Photo Giulio Menna

It is hard to say what the upside is of this book format. After all, if the same pages had been bound in a regular (non-accordion) fashion, it would accommodate the same amount of text. Perhaps the format was favoured because of a certain ease of use? It is easier, for example, to access the information in the book without using one’s hands. Also, without flipping any pages, the reader had access to a great deal more than the usual two pages of a book opening, which may perhaps have been handy in certain modes of use.

3. Rolls

Manchester, Chetham's Library, Armburgh 02 1024 (1430-1450)
Fig. 6 – Manchester, Chetham’s Library, Armburgh 02 1024 (1430-1450) – Source

What looks like a cigar, is actually the most common and oldest expandable bookish object: the roll (Fig. 6). This object probably held the most information in relation to its dimensions. Rolls had been in use for a long time when the book finally came around in the fourth century (see my post What is the Oldest Book in the World? and more information on rolls here). During the Middle Ages the roll format remained in use longest in administration. It was not until the late thirteenth century, for example, that cities in North-West Europe switched to the book form to write down their income and expenses – the city of Bruges still used rolls for this purpose in the 1280s.

Rolls can be quite long. One of the longest that survives from the medieval period is a mortuary roll that was carried to 253 monasteries, nunneries and cathedrals across England and France during the 1110s (source). Mortuary rolls were produced to commemorate the death of a prominent person, in this case Abbess Mathilda of Holy Trinity Abbey in Caen. Like writing a joint birthday card today, clerics in France would add their say to the roll, which grew and grew, until it finally reached a length of 22 meters (72 feet). Genealogical rolls could also be quite long (Fig. 7), though not as exceptionally long as the mortuary roll made for Abbess Mathilda.

Christchurch, University of Canterbury, MS 1 (15th century)
Fig. 7 – Christchurch, University of Canterbury, MS 1 (15th century) – Source

From time to time unusual rolls are encountered, like the one seen in Fig. 8. This one is special because the fourteenth-century object comes rolling out of a book (of slightly later date), which functions as its sleeve. The end of the roll (again holding a calendar) is simply pasted onto the book. The full roll measures an astonishing 130 cm (a little over 4 feet). One wonders whether the owner created this remarkable hybrid because it allowed for easy storage on the book shelf. A book placed among its peers, albeit with an unusual content.

The Hague, Royal Library, 130 E 26 (late 14th century)
Fig. 8 – The Hague, Royal Library, 130 E 26 (late 14th century) – Photo EK

What the Incredible Expandable Books in this post share is an effort to hold a lot of text in an object that occupies a modest amount of space, usually in one’s pocket. When there is a dire need to take information with you on the go, medieval readers were quite inventive, as my post Bag it, Box it, Wrap it shows. Interestingly, the expandable information carrier lives on in our own day. Not only are there still book designers who produce accordion books in the medieval fashion (like Peter Thomas, whose recent email correspondence inspired this post), but the expandable almanac at the outset of this post has actually become ubiquitous in the form of pocket maps, displaying such things as the layout of cities and underground stations.

R. Sutton, Petroleum Pocket Map (1886)
Fig. 9 – R. Sutton, Petroleum Pocket Map (1886) – Source

Echoing the roll hidden in a book, some of these maps hide in (and take on the form of) an actual book, like the 1886 edition that shows the location of oil wells (Fig. 9). As with their medieval peers, ease of use and portability are the driving forces behind getting a lot of information in an object with a tiny footprint. “Doing more with less” is clearly a universal urge.

17 thoughts on “The Incredible Expandable Book”

  1. I sit here surrounded by books, quite literally. My interest in the history of books began when, as a child, it seeped into my consciousness that books as books are a recent innovation in human history, That fascinated me. Rolls are useful, but not very portable. Or searchable. The invention of a portable method of transcription and dissemination of information must have spread like wildfire, and literacy with it. Now here I am, a pile of history books piled nearby, reference books on various topics on a handy bookshelf, a novel at my side, and several libraries with thousands of easily portable books available for the asking. Life-changing. Culture changing. I do much of my research online, especially early in a project, and there is no doubt that expands the availability of information, both in scope and in who can access it I think, though, that in terms of culture-change, even that is an extension of the portable book, not superceding it Though electronic media does return something to the mix we came close to losing: the oral transmisson of information, which is significant.

    Liked by 1 person

  2. Another fascinating read from my favourite blog. But many towns, in England, at least, went on using rolls for accounts, and some other purposes, well into the early modern period. Examples here in Norfolk include the borough of Lynn and England’s second city, Norwich.


  3. Reblogged this on I'm a Lady Butterfly and commented:
    The Incredible Expandable Book –
    “Like most objects, books are confined to the space they occupy, obedient as they are to the laws of nature. That is to say, unlike the Incredible Hulk, they do not normally expand beyond the limits of their own physicality. This post will challenge your beliefs if you agree with this statement. It draws attention to types of medieval books that do expand beyond their physical limits”


  4. Net nu ik zelf een onderzoekje doe naar de folding almanac en de folding calendar, plaatst u deze post. Ook Leiden heeft een prachtig exemplaartje van een vouwboekje (mijn zelfgekozen Nederlandse term, want Kneep & Binding kent deze binding niet). Het bijzondere is dat er uit 15e eeuws Engeland (inderdaad) een dertigtal vouw almanakjes is overgeleverd waar enkele artikelen over zijn gepubliceerd. Maar in overig Europa was het opvouwen al een paar eeuwen (iig italie 13e eeuw) eerder begonnen met specifiek kalenders als inhoud. En hier zijn er ook nog veel van overgeleverd. Omdat folding almanac in dit geval geen correcte naam is, maar het wel om eenzelfde soort boekje gaat, codicologisch gezien, heb ik het maar vouwboekje genoemd. Gumbert schijnt een mooi Duitstalig artikel te hebben geschreven over het faltbuch, maar dat heb ik helaas nog niet in handen kunnen krijgen.
    Voor nu ben ik bezig een inventarisatie te maken van alle overgeleverde vouwboekjes, ongeacht inhoud. En omdat ik ook boekbinder ben, probeer ik ook facsimile bindingen te maken van ze.
    Ik vind het een zeer bijzondere binding, het kleine broertje van het buidelboek, dat zeker meer aandacht verdient.


  5. Beautiful! I’m especially intrigued by the cross-shaped counting(?) symbols as in this picture. My quick guess is that the horizontal cross bar stands for ’10’, the curl for ‘5’ and the dashes to the right of the stem for ‘1’, so that the numbers read 3, 11, 19, 8, 16, etc. Correct?


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