fire
Smoke signals for example.
Advantages of oil lamps include providing a soft, warm light, being portable, and having a long burn time. However, disadvantages may include the risk of fire hazards, the need for refilling oil, and the potential for soot and smoke buildup.
smoke signals
Smoke signals were used to communicate with other people from far away when they were in trouble and needed help. Old Indian tribes would have special signals to communicate to there own tribe that was far away. Because anyone could see the smoke signals, the sender and the receiver of the smoke signals had their own special code.
what are the advantages and disadvantages to hiring your friends in you company
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It's strong and fire proof - but its expensive.
Indians used smoke to communicate from a distance. Also smoke signals are used to signal aircraft landing points, and people in distress, To make a smoke signal: Make a small fire, Addfresh greenery to the fire (leaves), and leave the amount of smoke generated because of the greenery will create enough of a signal to attract the attention of any person with any knowledge about survival skills.
no advantages of using.what
the advantage is the design is complicated
In "Lord of the Flies," the boys use green branches and leaves from the island to make the fire give off more smoke. They discover that adding these materials helps the fire create more visible smoke signals.