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KF5JRV > TECH 13.11.16 15:19l 27 Lines 1357 Bytes #999 (0) @ WW
BID : 5277_KF5JRV
Read: GUEST
Subj: Arc Lights
Path: IZ3LSV<IK6ZDE<VE2PKT<ZL2BAU<GB7YEW<N9PMO<NS2B<KF5JRV
Sent: 161113/1417Z 5277@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Arc Lights
As the practical use of electricity became evident and the electric
telegraph was in operation, it was not long before scientists were
looking towards making further use of this electricity. The next
advance of great importance, was the introduction of the electric
carbon arc light, which was exhibited in experimental form in 1808,
by Sir Humphry Davey. He used a large battery to provide current for
his demonstration, as these arc lights require a heavy current and no
means of mechanically generating electricity had as yet been developed.
The principle of these arc lights, is that when two carbon rods in a
circuit are brought together, an arc is created. This arc, which gives
off a brilliant incandescence, is maintained as long as the rods are just
separated and keep mechanically fed this way, to maintain the arc. As
the arc lights took a heavy current from these batteries, it was not until
about 1860, that practical use was made of them. By this time adequate
generating sources were developed and then they were only used mainly for
street lighting and in picture theaters. Although arc lighting was still
used until the early 1900's they were eventually superseded by the
incandescent light, except that most picture theaters use them in their
projectors even today.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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