Every employer carrying on any work in the prosecution of which persons are employed in compressed air shall cause all engines, boilers, steam-pipes, steam-gages, drills, caissons, air-pipes, air-gages, air-locks, dynamos, electric wiring, signal apparatus, brakes, buckets, hoists, cables, chains, ropes, ladders, ways, tracks, sides, roofs, timbers, supports, and all other equipment, apparatus and appliances used in connection with such work to be inspected at least once every working day by a competent person especially designated for that purpose; and if any defect in such equipment, apparatus or appliances is found, a report thereof in writing shall forthwith be made by the inspector to the employer and the defect shall be immediately repaired.