Provide a piece of copper wire, about ten inches long, and fix at one
end of it a piece of wax taper: take a pint bottle of hydrogen, and
place the mouth downwards; light the taper, introduce it into the
bottle, and the gas will take fire, and burn slowly towards the mouth,
where it is in contact with the air. If, however, the taper be passed
up into the bottle, it will be extinguished; but, on gently withdrawing
it through the burning hydrogen, the wick will be rekindled. This may
be done several times in succession with the same portion of gas.