The Medieval Invention That Changed The Course Of History | The Machine That Made Us | Timeline

Summary

Stephen Fry traces how Johannes Gutenberg’s 15th-century printing system made books reproducible on a large scale and transformed the spread of information in Europe. The documentary combines historical research with a practical experiment: Fry and a team reconstruct a Gutenberg-style press and print a page using period-inspired materials and techniques.

Before the printing press

• In medieval Europe, books were generally copied by hand, often by scribes working in monasteries. This was slow, physically demanding work, and handwritten books were costly and relatively scarce.
• Hand-copying also made errors likely. A printing system could produce many consistent copies of a text.
• Demand for books was growing beyond monasteries, including in universities and commercial settings. The Church, too, had reasons to value printing: it could help distribute consistent texts and documents.
• Gutenberg’s background may have helped prepare him for the task. His father was a merchant whose work brought him into contact with Mainz’s goldsmiths, and Gutenberg may have attended university. The documentary emphasizes that little is known about his early life or appearance.

Gutenberg’s idea and its development

• Gutenberg’s press was probably inspired in part by the screw presses used in wine-making, which were familiar in the Rhine region where he grew up. These presses offered a model for applying force through a screw and platen.
• Turning that basic mechanism into a reliable printing machine required several elements to work together:
  • A press that could apply controlled pressure.
  • A way to move the paper and printing surface into position.
  • Reusable, movable type that could be arranged into different texts.
  • A practical supply of paper and financing for development.
• The documentary presents Gutenberg as both a technical innovator and a businessman. His work took years and depended on investors and skilled craftspeople.
• In Strasbourg, he worked with partners and craftsmen, including a carpenter, while keeping the project secret to protect it from competitors. A proposed side business making mirrors for pilgrims was disrupted when plague caused a pilgrimage to be postponed, damaging the partnership’s prospects.
• Gutenberg later returned to Mainz and secured new financing from Johann Fust. He tested the technology on smaller jobs, such as a Latin grammar and church indulgences, before undertaking the much larger Bible project.

Reconstructing the technology

Because no Gutenberg press or contemporary image of his original machine is known to survive, the team’s reconstruction is based on clues from later presses, historical analysis, and the printed books themselves.

• Press builder Alan May designed a one-pull press. Evidence from the Gutenberg Bible suggests Gutenberg printed one page at a time, unlike later presses that could print two pages in sequence.
• The documentary compares the reconstruction with later press designs and considers whether an illustration by Albrecht Dürer might preserve features of an older press.
• Fry helps make components and describes how the press’s wooden screw, frame, and platen press paper against inked type.

How the movable type was made

The type-making demonstration explains the steps involved in producing a reusable metal letter:

1. Create a punch: Carve the desired letter into the end of a steel bar. Each design required careful handwork; a full set of Bible type would have involved hundreds of characters and taken substantial time.
2. Strike a matrix: Hammer the punch into copper to create an impression of the letter.
3. Set up the mold: Place the matrix at the bottom of a two-part adjustable mold, which forms the cavity for the type.
4. Cast the letter: Pour molten type metal—described as a mixture of lead, tin, and antimony—into the mold.
5. Release and repeat: Open the mold and remove the cast letter. Repeating the process produces multiple copies of the same character.

This system made it possible to produce separate, consistent letters, arrange them into lines, and reuse them for other texts. Gutenberg also used variations in letter widths to create the even, carefully aligned appearance of the Bible’s text.

Paper and printing

• Vellum, made from animal skins, was used for some high-status books but was far too costly for a large print run. The documentary estimates that a vellum Bible would require about 140 calfskins per copy.
• Paper made from cloth rags offered a more practical alternative. At a Basel paper mill, Fry observes the traditional process:
  • Pound cloth rags into pulp using water-powered hammers.
  • Mix the pulp in a vat.
  • Dip and lift a framed screen through it, shaking it so the fibers settle into a sheet.
  • Drain and dry the sheet before it can be used for printing.
• During the reconstructed printing demonstration, the type is arranged and inked, a sheet is positioned and pressed, and the fresh impression is inspected. The work is collaborative: while one person operates the press, others prepare the next sheet and manage the inking and handling.
• The documentary stresses that printing was not the only labor involved. Gutenberg’s Bible also required typesetting, printing, hand decoration, and binding.

The Gutenberg Bible and its consequences

• Gutenberg’s Bible, printed in the 1450s, demonstrated the quality and potential of the new process. Its typography was carefully made and drew on conventions used by manuscript scribes.
• The first edition is described as consisting of about 180 copies, each with more than 1,200 pages. Some copies were printed on vellum, but most used paper.
• The documentary says the Bible caused a sensation when copies were shown at the Frankfurt trade fair in 1454. Fewer than 50 original copies survive today.
• Gutenberg did not enjoy the full financial rewards of his invention. When Fust demanded repayment, Gutenberg could not pay and had to surrender his printing equipment. He later established another workshop with help from friends and eventually received recognition and a pension from an elector.
• The documentary’s central conclusion is that movable-type printing enabled texts to be reproduced and circulated on a scale previously impossible. It helped carry religious, philosophical, and other ideas across Europe and contributed to the cultural changes associated with the Renaissance. The printed word, it argues, became a foundation of modern society.

Speakers and sources featured

• Stephen Fry — Presenter and narrator; leads the historical journey and participates in the reconstruction.
• Alan May — Press builder who designs and constructs the Gutenberg-style press.
• Martin Andrews — Printing expert who advises on the press and printing process.
• Stan — Type-making specialist who demonstrates punch-, matrix-, and mold-based casting; no surname is clear in the subtitles.
• Dr. Schneider — Expert on monastic life and the work of medieval scribes.
• Unidentified local historians or guides — Provide information about Gutenberg’s birthplace, Mainz, Strasbourg, and the pilgrim-mirror trade.
• Unidentified Basel paper-mill worker or guide — Demonstrates traditional rag-paper making.
• Unidentified Gutenberg Bible curator or librarian — Discusses the Bible’s appearance, production, and survival.
• Historical and material sources discussed — The Gutenberg Bible, forensic analysis of its printing, an illustration of a press by Albrecht Dürer, and later press designs used to inform the reconstruction.