Le timbre Sonnclair — L’Officiel du cycle, 16 June 1951, the Continuous-Ring Bell with No Transmission, in Duralinox, on the Équipements et Outillage Page

From L’Officiel du cycle, du motocycle et du camping, 16 June 1951, N° 17, page 13: le timbre Sonnclair: a bell with a continuous ring driven from the wheel, in duralinox, model AG 3; photograph of the bell; agent M. Lachèvre, Paris. The title, headings, captions and lists are transcribed as printed; the text is summarized in Ebykr’s words, and the page images carry it in full.

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Le timbre SONNCLAIR

[Ebykr summary; the article’s text is not reproduced. The bell is said to bring something truly new: a warning device giving a continuous ring without any system on the wheel, and therefore without a transmission. The result comes from a clever internal arrangement whose characteristic parts are an escapement, itself driven by a central gear on the axle, that drives and then releases a free plate. This plate is thrown like a flywheel and carries three eccentrics, with some play on their pin, round its edge; they strike the bell for as long as the plate turns, long enough that the finger need work the mechanism only at spaced intervals.]

[Ebykr summary, after the photograph. An ingenious device prevents the annoying loss of the “cloche”, which screws itself back on automatically while the bicycle is in motion. The continuous Sonnclair warning device is made of duralinox · AG 3 and is extremely robust, elegant and very compact, with a ring that is powerful and pleasant.]

L’Agent dépositaire de cette production
est M. LACHÈVRE, de Paris.

[Text article set in italic roman type under a title in roman type, the word SONNCLAIR in heavy capitals. Across the middle of the column stands a halftone picture of the bell seen from above and slightly to one side: a dark, rounded dome with a bright highlight and a small round boss at its crown, a short lever arm at the left ending in a round button stamped in a ring with the letters SONNCLAIR and the word Déposé, and a small loop at the lower edge. No caption, signature or agency mark appears.]