Cars containing explosives to be transshipped by water shall be conveyed on car floats to the vessel, on which explosives are to be loaded, between sunrise and sunset and when there is no dense fog. City Code, 1927, art. 15, §67 1950, art. 11, §69 1966, art. 10, §68 1976/83, art. 10, §68 Ord. 13-336