Calamus sphaeralis,[1] sive calamus atramentarius,[2] sive sphaerigraphum,[1][3] sive stilus sphaeratus,[4] est stilus qui atramentum per globulum capiti stili infixum in chartam aliamve materiam premit. Linea a calamo sphaerali facta, aliter atque linea stili plumbati, gummi deletili non eradi potest. Atramentum adhibitissimum est caerulei ultramarini simile, sed etiam calami atramenti aliorum colorum conficiuntur.
László Bíró diurnarius Hungarus, qui in expositione mundana Budapestini anno 1931 habitā stilum novi generis proposuit, inventor calami sphaeralis habetur.
Notae
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