thereby a small conical flame possessing intense heat. It is used in
soldering silver, brass, etc. A mixture of oxygen and hydrogen when
ignited constitutes the hydrogen blowpipe, invented by Dr. Hare of
Philadelphia.


What is Magnesium Light?

When the metal magnesium is rolled out into a fine ribbon and heated
to red heat it burns with a dazzling light.


Which is the most powerful artificial light?

The so-called Electric light. This light, whether produced by a series
of galvanic cells or by dynamic power, is the most brilliant and
useful.


What is a Rainbow?

The rainbow is that beautiful semi-circular band or arc of different
colors in the clouds during the occurrence of rain in sunshine. When
the clouds opposite the sun are very dark and rain is falling from
them, the rays of the sun are divided by the raindrops as they would
be by a prism. There are often two rainbows at the same time, because
the primary bow is again reflected to another layer of clouds.


What is a Prism?