A mosquito coil turned the car into a small refuge
A drive-in audience could not simply shut out insects: people opened windows for conversation and fresh air, while others sat outside their cars. A smoldering mosquito coil offered a portable fix that did not require electricity or spraying the whole field. Its slow-burning spiral could sit on a dashboard and keep releasing insect-repelling smoke through much of a film.
How the smoke discourages mosquitoes
The coil is made to burn gradually, carrying an insecticide into the air as it smolders. Many modern coils use pyrethroids, chemicals that affect insects’ nervous systems; the smoke can repel mosquitoes and, at sufficient exposure, disable or kill them. The point is not to create a sealed cloud around a car. Rather, the coil adds a local layer of deterrence where people are sitting, though wind and open air can dilute it.
That made the coil a fitting piece of drive-in equipment: the theater could provide a simple object patrons could use at their own spot, instead of trying to control bugs across a large outdoor venue. The glowing screen drew attention forward; the little smoking spiral handled a problem happening right beside the audience.**
