If any operation or maintenance charge is unpaid on the 1st day of the third calendar month after it became due a penalty of 1 per centum of the amount unpaid shall be added thereto, and thereafter an additional penalty of one-half of 1 per centum of the amount unpaid shall be added on the 1st day of each calendar month if such charge and penalties shall remain unpaid.
(Aug. 13, 1914, ch. 247, §6,
Section is comprised of part of first sentence of section 6 of act Aug. 13, 1914. Remainder of first sentence of such section 6 is classified to sections 479, 493 and 495 of this title; second and third sentences of such section 6 are classified to sections 496 and 497 of this title, respectively.
Act Dec. 5, 1924, reduced the additional penalty from 1 per centum to one-half of 1 per centum.