(c) The code for all work in compressed air, when the whistle and repeating rap are used, shall be as follows:

1. (1) One whistle or rap—Hoist.
2. (2) One whistle, or rap, with a rattle—Hoist slowly.
3. (3) Two whistles or raps—Come to a stop at once.
4. (4) Three whistles, or raps, with a rattle—Lower slowly.
5. (5) Four whistles or raps—Open high pressure.
6. (6) Four whistles, or raps, with a rattle—Shut off high pressure.
7. (7) Five whistles or raps—Call person in charge.
8. (8) Six whistles or raps—Lights are out.
9. (9) Seven whistles or raps—Lights are all right.
10. (10) Eight whistles or raps—Emergency call.

(d) The code for the operation of any car, cage or bucket shall be as follows:

1. (1) One bell—Stop if in motion or hoist if not in motion.
2. (2) Two bells—Lower.
3. (3) Three bells—Run slowly and carefully.