138. Rescue tracings.- (1) There shall be kept at a below ground mine, more than three legible tracings of the working of the mine upto a date not before three preceding months.

(2) The tracing shall show the system of ventilation in the mine and in particular, the general direction of air-current, every point where the quantity of air is measured, every air-crossing, ventilation-door, stopping, booster fan and any other principal device for regulation and distribution of air, fire-dams, preparatory stoppings, every fire-fighting equipment, every water-dam with dimensions and other particulars of construction, every pumping, telephone and ambulance station, every room used for storing inflammable material, reserve stations and every haulage and travelling roadway.