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The book

All 50 machines, in four editions.

Order direct at 50machines.com.

Front cover: 50 Machines, with an isometric drawing of a Stirling engine.

All prices include VAT.

Delivery takes approx. 2 weeks and no later than 30 calendar days from the order. During the holiday season, printing can take up to 7–10 business days; express shipping does not shorten printing time.

You have 14 days to withdraw. © 2026 Rolando Zubirán. Exploitation rights assigned exclusively to ASSEMBLR VENTURES, S.L. The book is published through Lulu. Paperback ISBN 978-1-291-48311-6. The economic operator responsible for the book in the EU is ASSEMBLR VENTURES, S.L., Calle Príncipe de Vergara 13, 4th floor, door E, 28001 Madrid, Spain, direccion@quantumhive.es. Read the safety notice before you build anything.