[=Owner, lessee or agent shall provide safety lamps.=] The owner, lessee or agent of a mine generating fire-damp, so as to be detected by a safety lamp, shall keep on hand in proper condition for use, not less than four approved safety lamps, and upon request of the district inspector of mines, shall provide such additional safety lamps as in his judgment may be required to meet any probable emergency. [=Owner, lessee or agent shall provide shields on mining machines.=] The owner, lessee or agent of a mine, shall provide and maintain a sufficient shield on each mining machine used in such mine, as may be authorized by the chief inspector of mines, or the district inspector of mines, for the protection of those employed in operating same. (Sec. 957; Penalty, Sec. 976.) =SIGNAL CODE.= Sec. 942. [=Signals at mines, how conducted; devices to be used.=] At each mine operated by shaft, the means of signaling to and from the bottom man, the top man, and the engineer shall consist of a tube, or tubes, or wire encased in wood or iron pipes, through which signals shall be communicated by electricity, compressed air, or other devices. The following signals are provided for use at mines where signals are required: =SIGNAL CODE.= =From the Bottom to the Top.= [=One ring or whistle.=] One ring or whistle from the bottom to the top shall signify to hoist coal or the empty cage, and also to stop either when in motion. [=Two rings or whistles.=] Two rings or whistles shall signify to lower cage. [=Three rings or whistles.=] Three rings or whistles shall signify that men are coming up; when return signal is received from the engineer, men will get on the cage, and cager shall ring or whistle one to start. [=Four rings or whistles.=] Four rings or whistles shall signify to hoist slowly, implying danger. [=Five rings or whistles.=] Five rings or whistles shall signify accident in the mine and a call for a stretcher. =From the Top to the Bottom.= [=One ring or whistle.=] One ring or whistle from the top to the bottom shall signify: All ready, get on cage. [=Two rings or whistles.=] Two rings or whistles shall signify: Send away empty cage. [=Addition to code, when allowed; code must be posted at top and bottom.=] Provided, that the management of any mine, may, with the consent of the district inspector of mines, add to this code of signals in his discretion, for the purpose of increasing its efficiency, or of promoting the safety of the men in said mine, but whatever code may be established and in use at any mine must be furnished by the mining department, conspicuously posted at the top and at the bottom and in the engine room, for the information and instruction of all persons concerned.