18.(1) If any accident occurs to a boiler or steam-pipe, the owner or person in charge thereof shall, within twenty-four hours of the accident, report the same in writing to the Inspector. Every such report shall contain a true description of the nature of the accident and of the injury, if any, caused thereby to the boiler or to the steam-pipe or to any person, and shall be in sufficient detail to enable the Inspector to judge of the gravity of the accident. (2) Every person shall be bound to answer truly to the best of his knowledge and ability every question put to him in writing by the Inspector as to the cause, nature or extent of the accident.