always nice to see another Daniel Rebour drawing! I'm slowly making my way through Heiko's flickr pages.
I'm trying to figure out what a "kilo" translates into. I'm inclined to think it might be a kilopascal (kpa), but 4kpa is only 27.6 psi. I'm not sure how big the tubulars were back then, but 27.6psi seems quite low.
Of course, translation is always difficult, and especially when different eras and cultures are part of the translation. I like the comment "The right-angled connector, which does not change the rider's usual gesture", which I think means that the rider uses the same position/posture to use it as the rider would use when operating a Silca Impero pump. In the current culture in the USA, "the rider's usual gesture" suggests some sort of body language that is intended to send a message... probably not a happy message either, when fixing a flat.
Steve in Peoria