This lecture was given at the Symposium on ARTE E TECNOLOGIA, organis-ed by the Gulbenkian Foundation, Lisbon,
from 17-19 Dec.1987. (Published with other contributions in a book-form in 1993, by the same Foundation).
Figure D - The Lyman, Balmer, Paschen & Brackett Series (with
fine structure) of the Hydrogen atom (detail),1987. 750 x 350 cm