WAP – WARNING! Air Pockets


[25x30x40 cm, 165 parts, about 90Mb]


The Mechanism. WAP is a paper automaton whose main mechanism is Redtenbacher`s variation of the Cartwright straight-line mechanism, a twin gear driving a common slider crank. If the two gears have different but almost equal number of teeth, the up and down motion of the bar is then an addition and subtraction of two sinusoidal functions. The straight line generation, determined by the vertical motion of the bar, was a very important problem in the early history of mechanics. In WAP, the “random” motion of the unlucky airplane is generated at the center of the beam, that is free to spin. At that point, the two sinusoidal movements originate the oscillation that, together with the up and down motion of the bar, results in the air-pocket-like shaking up.

(further information at http://kmoddl.library.cornell.edu/index.php)


Cartwright mechanism

Redtenbacher's variation

Redtenbacher’s variation












The main mechanism in WAP is based on two gears with ratio equal to 1.2 (18/15 teeth). The entire cycle is completed after five turns of the handle.

Ferdinand Redtenbacher (1809-1863). The transformation of mechanical technology from a mainly workshop-based profession into an engineering science, particularly in the area of design of machines and mechanisms, is closely related with the name of Ferdinand Redtenbacher. He was of eminent historical importance for Porträtthe evolution of mechanical engineering to a technical science in the nineteenth century. Redtenbacher’s role as the originator of mechanical engineering as a science in Germany is fundamental and of general interest since the introduction of science into engineering is a “sine qua none” for the development of a powerful high tech industry. As a professor and the director of the Polytechnic School in Karlsruhe, Germany – today the University of Karlsruhe (TH) –, Redtenbacher’s influence therefore helped establish the German manufacturing systems engineering even today. (from Wauer, J., Mauersberger, K., Moon, F. C., 2010. Ferdinand Jakob Redtenbacher (1809–1863), in Distinguished Figures in Mechanism and Machine Science, History of Mechanism and Machine Science, Ceccarelli, M. Ed., Springer Netherlands).


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DRACULA (Hako version, 2004)



Years ago, paper modellers community was very excited by the so called hako designs, small paper figures mainly made of boxy parts assembled together. There was a bloom of paper hakos, some of them truly exquisite. As many others, I designed some hako models, too.

Dracula was the first one…


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Nocturnal Celestial Globe / Globo Celeste Notturno

Plancius' nocturnal paper globe

          paper globe

Petrus Plancius (Pieter Platevoet, 1552-1622) was a famous Flemish cartographer. He included new constellations in the austral celestial emisphere. In 1612, he drew 12 gores for a 14.5 cm diameter celestial globe, with eight new constellations inspired to the Bible. For the present model, the original gores published in 1649, were downloaded from the Bibliothèque nationale de France website. The colours of the original file were digitally converted in the “nocturnal” version here presented.

Petrus Plancius (Pieter Platevoet, 1552-1622) fu un famoso cartografo fiammingo. Autore di numerosi globi celesti, egli introdusse nuove costellazioni nell’emisfero australe. Nel 1612 disegnò 12 fusi per un piccolo globo celeste del diametro di 14.5 cm, in cui compaiono otto nuove costellazioni ispirate alla Bibbia. Per questo modello, i fusi originali, pubblicati nel 1649, sono quelli scaricabili dal sito web della Bibliothèque nationale de France. Con un semplice processo di ridefinizione della gamma cromatica, i fusi sono stati trasformati nella versione “notturna” qui proposta.



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Peace Dove / Colomba della Pace

Release Year: 2004

langSmall_it     langSmall_de     langSmall_en     langSmall_jp     langSmall_fr     langSmall_es



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Santa and his favourite Reindeer (1923 LA Times animated card recolored)


Background: (C)-Zastavki.com


In 1922-23, LA Times newspaper offered to its readers a series of animated cards by Dan Rudolf to cutout and assemble.
Some years ago (maybe in 2007) I downloaded these cards from the Barnacle Press site, a web archive dedicated to vintage comic strip, dating from the turn of the last century.
Since August 2012, after a site crash, the Barnacle Press is recreating part of the image archive that was lost when the site went down. The archive comprises 27 animated cards in the section Papercraft of the Comic Supplement page, but the resolution is now lower than it was in 2007.
Fortunately, recently I have discovered the Christine Nelson Flickr collection with 39 hi-res. LA Times animated cards. So, the fans of these fascinating vintage cards have a wonderful opportunity…

In the meantime, enjoy the colored (by myself) version of the Santa and his favourite Reindeer (Rudolf?… but, what about his red noise?)

Nel periodo 1922-23, il quotidiano Los Angeles Times offrì ai suoi lettori una serie di cartoline animate disegnate da Dan Rudolf da ritagliare ed assemblare.
Alcuni anni fa (forse nel 2007) ho scaricato queste cartoline dal sito Barnacle Press, un archivio web dedicato ai fumetti d’inizio secolo. Dallo scorso agosto, dopo un crash del sito, il Barnacle Press sta ricostituendo parte dell’archivio immagini perduta. L’archivio contiene 27 cartoline animate nella sezione Papercraft della pagina Comic Supplement, ma la risoluzione delle immagini è più bassa di quella del 2007.
Fortunatamente, recentemente ho scoperto la collezione Flickr di Christine Nelson con 39 cartoline animate del Los Angeles Times. Beh, i fan di queste affascinanti cartoline vintage hanno una meravigliosa opportunità…

Nel frattempo, godetevi questa versione colorata (da me) di Babbo Natale con la sua renna preferita (Rudolf?… ma non ha il naso rosso…).


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Cassini’s Terrestrial and Celestial Globes (Christmas Balls version)

Giovanni Maria Cassini (1745-1824) was regarded as one of the last great Italian globemakers of the 18th century. Here, I present two 15 cm diameter globes in a Christmas ornament version. The larger version of the terrestrial globe was already proposed in my previous post. The celestial globe is a new entry. The hi-res. digital reproduction of the twelve gores and the two polar calottes are available at the wonderful David Rumsey Map Collection website, that is really worth of visiting. The celestial globe gores were published in 1792 in Rome. They were based upon the astronomical observation of Flamsteed and Lacaille, and depict all known constellations with stars varying in size according to their magnitude.

Anothe great web site where you can get a lot of information about this and many other celestial globes and maps is Atlas Coelestis by F. Stoppa. Unfortunately, the site is in Italian only, but the number of wonderful picture is so large that I suggest to visit it.

Giovanni Maria Cassini (1745-1824) è considerato uno degli ultimi grandi costruttori italiani di globi del 18° secolo. In questo post presento due globi da 15 cm di diametro in versione natalizia. Una versione più grande del globo terrestre è stata già presentata nel post precedente; il globo celeste è una new entry. Le riproduzioni digitali ad alta risoluzione dei dodici fusi e delle due calotte polari sono scaricabili dal meraviglioso sito web della David Rumsey Map Collection, che vale veramente la pena di visitare.

I fusi per il globo celeste vennero pubblicati a Roma nel 1792. Essi sono basati sulle osservazioni astronomiche di Flamsteed e Lacaille, e raffigurano tutte le costellazioni allora conosciute con stelle di grandezza variabile a seconda della loro magnitudo.

Un altro imperdibile sito web pieno di informazioni su questo e molti altri globi e mappe celesti è l’Atlas Coelestis di F. Stoppa.

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Cassini’s Terrestrial Globe / Globo Terrestre di Cassini

paper globe, Cassini's terrestrial globe
Giovanni Maria Cassini (1745 – 1824) was an Italian globe maker, geographer, engraver, and cartographer. His  main cartographic work was the Nuovo Atlante Geografico Universale of  1792-1801. In 1790, the Calcografia Camerale of Rome published his twelve terrestrial globe gores, that updated the world cartography after the three voyages of Captain James Cook around the globe. The title of the terrestrial globe, printed on the globe itself, is:
To my knowledge, there are two versions of the gores freely available online at high resolution: one at the David Rumsey Map Collection, where you can enjoy a fascinating experiment of “3D virtualization“, and the other at the Library of Congress, Geography and Map Division. I have used the last ones, that are shown below:
The paper globe has a diameter of 30 cm, and it is made completely of paper, except the axis, made with a 6 mm diameter wooden rod. The paper used in the original design is glossy photopaper for the globe and the cover of the base-support. The paper used for the construction of the base-support is plain paper 210 gsm. The project includes fully illustrated instructions in Italian and English.

Giovanni Maria Cassini (1745 – 1824) fu un costruttore di globi, geografo, incisore e cartografo italiano. La sua opera principale fu il Nuovo Atlante Geografico Universale del 1792-1801. Nel 1790 la Calcografia Camerale di Roma pubblicò I suoi dodici fusi per globo terrestre, aggiornato secondo le ultime rilevazioni effettuate durante I tre viaggi attorno al mondo del Capitano inglese James Cook.

Per questo progetto ho usato i 12 fusi ad alta risoluzione scaricabili dal sito della Library of Congress (USA) (Geography and Map Division).

Il globo ha 30 cm di diametro, ed è fatto completamente di carta, eccetto l’asse di rotazione che è costituito da un tondino di legno di 6 mm di diametro. Nel progetto originale ho usato carta da 210 g/mq e per il globo ed i rivestimenti carta fotografica lucida. Il progetto include istruzioni dettagliate in italiano ed inglese.

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Life is a Challenge / La Vita è una Sfida

Life is a Challenge
Natural adaptation aims to provide the best performances, even though not for any needs. I was impressed by the posture of this 3D model, that captures the giraffe efforts in reaching the primary source of life: the water.
Size (mm): H250, L434, W240
Medium: paper 160 gsm
Difficulty (1-5): 4
Model retopologized and adapted from the original 3D model at the “INRIA Gamma team research database Website Collections”. Texture by struckdumb. Setting: picture modified from the original “Times Square” by Martin Duerr.

L’adattamento naturale mira a fornire le prestazioni migliori, anche se non per ogni esigenza. Sono rimasto colpito dalla postura di questo modello 3D, che cattura gli sforzi della giraffa nel raggiungere la fonte primaria di vita: l’acqua.

Dimensioni (mm): Alt. 250, Lung. 434, Larg. 240
Medium: carta 160 g/m2
Difficoltà (1-5): 4

Modello ritopologizzato ed adattato dall’originale modello 3D disponibile sul sito “INRIA Gamma team research database Website Collections”. Texture di struckdumb. Ambientazione: fotografia modificata dall’originale “Times Square” di Martin Duerr.

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Hammer & Sickle / Falce e Martello

An hour’s drive from Rostov, vast wheat fields welcome visitors to Zernograd, as do a couple of relics of the old Soviet days: a hammer-and-sickle monument and a statue of Lenin. Zernograd became a showpiece of the Soviet collectivized farm system with help from American sympathizers who arrived in the 1920s with U.S. tractors and combines. Now, the town is again in the vanguard of Russian agriculture.
[Thurow, Roger. “Grain Drain: New Farm Powers sow the Seeds of America’s Agricultural Woes. ” Wall Street Journal, 18 June 2004, sec. A1.]




Retopologized and adapted by paperPino from the original 3D model by Alexander Lvov


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Happy Holidays / Buone Feste

Merry Christmas and Happy 2012

Buon Natale e Felice 2012

Try ElfYourself at: http://elfyourself.jibjab.com

Naurunappula: Raaputusarvat on muuten historian… – Netticasino

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