Section 426. Equipment

Every employer of persons for work in compressed air
  shall:
    1.  Connect  at  least two air pipes with the working chamber and keep
  such pipes in perfect working condition;
    2.  Attach  to  the  working  chamber  in  accessible  positions   all
  instruments  necessary to show its pressure and keep such instruments in
  charge of competent persons, with a period of duty for each such  person
  not exceeding eight hours in any twenty-four;
    3. Place in each shaft a safe ladder extending its entire length;
    4. Light properly and keep clear each passageway;
    5.  Provide  independent  lighting systems for the working chamber and
  shaft leading to it, when electricity is used for lighting;
    6. Guard lights other than electric lights;
    7. Protect workmen by a shield erected in  the  working  chamber  when
  such  chamber is less than ten feet long and is suspended with more than
  nine feet space between its deck and the bottom of the excavation;
    8. Provide for and keep accessible to employees working in  compressed
  air a dressing room heated, lighted and ventilated properly and supplied
  with benches, lockers, sanitary waterclosets, bathing facilities and hot
  and cold water;
    9.  Establish  and  maintain  a medical lock properly heated, lighted,
  ventilated and supplied with medicines and surgical implements, when the
  maximum air pressure exceeds seventeen pounds.