Page:A History Of Mathematical Notations Vol I (1928).djvu/55

Rh 56. In certain sixteenth-century Portuguese manuscripts on navigation one finds the small letter b used for 5, and the capital letter R for 40. Thus, xbiij stands for 18, Ri ij for 43.



A curious development found in the archives of one or two English courts of the fifteenth and sixteenth centuries was a special Roman