Heat and light were provided by paraffin burners.
Despite being a protected area, they are subject to encroachment and clearance by charcoal burners, leaving a relatively pristine core within more disturbed areas of forest.
If the pilot flame goes out, the voltage drops and an electric circuit turns off the gas supply to the burners and the pilot flame.
Image incense burners prompt an entirely different series of speculations.
To disinfect work areas, hands and tissues, 70 % alcohol (an antiseptic that is freely sold) and 96 % alcohol (for burners) were used.
One of the options considered for replacing flow cabinets was to work near alcohol burners.
There appears no other reason for the word 'investigation' here, as the process of fog dispersal by paraffin burners requires no obvious investigative process.
There may be charcoal pans where charcoal burners camped periodically to use the wood from the area around to produce charcoal.
