Of course this is not necessary when non-inflammable film is used.
He placed glowing embers upon ledges in the walls, upon stone slabs, or even upon suspended devices of non-inflammable material.
It will interest you to know that the airships of the future are expected to be filled with this non-inflammable helium.
Hydrobromic acid gas is colourless and non-inflammable; it extinguishes flame.
These compounds are insoluble in ether, are non-inflammable and exceedingly reactive.
This is harder than celluloid and non-inflammable, but has the disadvantages of being more brittle and of absorbing moisture.
On the other hand bakelite has the advantage in being tasteless, odorless, inert, insoluble and non-inflammable.
The production of films composed of non-inflammable material has also engaged the attention of inventors.
Then comes the war with its incendiary bullet and the need of a non-inflammable content for balloons and dirigibles.