Interesting faxes thread

[Uncwilly]

Originally Posted by a1call

1 femtosecond has the same ratio to 1 second as 1 second does to 31675 millennia.

For practical purposes 1 nanosecond is 1 foot when concerned with transmission of light/electrical impulses on fibre / wire.



Chile is 11 European countries long. (see attached)

[Dr Sardonicus]

Originally Posted by Uncwilly

For practical purposes 1 nanosecond is 1 foot when concerned with transmission of light/electrical impulses on fibre / wire.

If memory serves, Grace Hopper used segments of wire to illustrate this.

[LaurV]

Originally Posted by kladner

I fume at that. Don't superconducting magnets have a more productive claim?
As I thought, helium is produced via distillation from natural gas.

Yet, it is still non-renewable. Natural gas does not contain helium, I mean, chemically. Helium is just impurity. Once extracted, consumed, it raises in the upper atmosphere and it is lost in space. The only way to make it is by fusion/fission. The planet will run out of it sometimes in the future.

[storm5510]

People in an underground shelter during the bombing of Dresden, Germany, near the end of WWII in Europe, were boiled alive by the intense heat after the shelter flooded with water. Their skeletons were found in the bottom of a greenish-brown liquid in the shelter.

[a1call]

Originally Posted by Uncwilly

For practical purposes 1 nanosecond is 1 foot when concerned with transmission of light/electrical impulses on fibre / wire.

There’s a trick to grasp exactly how short a femtosecond is. Astronomers use the unit of “light year” to describe very large distances. One light year, or the distance the light travels over the time span of a year, is roughly 9.461 quadrillion km in our daily unit.

Very short time can be described the other way round. For example, we can consider 1 microsecond, or one millionth of a second, as 300 light meters, using the distance the light can travel during the time span. In this scheme, a femtosecond is 0.3 light micrometers, which is roughly the size of a virus.

https://www.nims.go.jp/ldynamics/en/How_short.html

[a1call]

The g-force of the Earth is 1 g.
The g-force of the sun is 28.02 g.

https://en.m.wikipedia.org/wiki/Surface_gravity

[xilman]

Originally Posted by LaurV

Yet, it is still non-renewable. Natural gas does not contain helium, I mean, chemically. Helium is just impurity. Once extracted, consumed, it raises in the upper atmosphere and it is lost in space. The only way to make it is by fusion/fission. The planet will run out of it sometimes in the future.

I call BS.

There is a truly vast amount of He in the atmospheres of the gas and ice giants.

[a1call]

Fax-Machines predate telephones by more than a decade.
This gentleman patented a Fax-Machine in 1843.
Oh, he also invented the Earth-Battery and the Electric-Clock.

Bain worked on an experimental fax machine from 1843 to 1846. He used a clock to synchronise the movement of two pendulums for line-by-line scanning of a message. For transmission, Bain applied metal pins arranged on a cylinder made of insulating material. An electric probe that transmitted on-off pulses then scanned the pins. The message was reproduced at the receiving station on electrochemically sensitive paper impregnated with a chemical solution similar to that developed for his chemical telegraph. In his patent description dated 27 May 1843 for "improvements in producing and regulating electric currents and improvements in timepieces, and in electric printing, and signal telegraphs," he claimed that "a copy of any other surface composed of conducting and non-conducting materials can be taken by these means".[6] The transmitter and receiver were connected by five wires. In 1850 he applied for an improved version but was too late, as Frederick Bakewell had obtained a patent for his superior "image telegraph" two years earlier in 1848.

Bain's and Bakewell's laboratory mechanisms reproduced poor quality images and were not viable systems because the transmitter and receiver were never truly synchronized. In 1861, the first practical operating electro-mechanical commercially exploited telefax machine, the Pantelegraph, was invented by the Italian physicist Giovanni Caselli. He introduced the first commercial telefax service between Paris and Lyon at least 11 years before the invention of workable telephones.[7][8]

https://en.wikipedia.org/wiki/Alexander_Bain_(inventor)

[PhilF]

Originally Posted by xilman

I call BS.

There is a truly vast amount of He in the atmospheres of the gas and ice giants.

Get busy on getting it here. Then we won't have to worry about helium balloons.

[Dr Sardonicus]

Originally Posted by storm5510

People in an underground shelter during the bombing of Dresden, Germany, near the end of WWII in Europe, were boiled alive by the intense heat after the shelter flooded with water. Their skeletons were found in the bottom of a greenish-brown liquid in the shelter.

Plenty of folks suffocated in underground shelters because of the fire, or drowned when water mains broke and the shelters flooded. Also many were boiled alive when they sought refuge in "static tanks," which were large pools of water placed around the city to provide water if the distribution system failed.

[storm5510]

Originally Posted by xilman

There is a truly vast amount of He in the atmospheres of the gas and ice giants.

In the 1930's, Germany wanted Helium for their airships. No country would sell it to them after Hitler took over.

About the Hindenburg fire. Its skin was not seamless. It was made up of large panels laced together. Half-inch gaps were left between the panels to allow any leaking hydrogen gas to easily escape. These panels had been soaked in a liquid mixture containing aluminum powder and iron oxide. A professor in Great Britain determined that an electrical charge would build up in the panels to varying levels when the ship moved through the air. He closely studied all the old film which had been shot from different locations at the air station in NJ. He saw an electrical arc in a few frames near the tail on top. It was hot enough to ignite one of the panels. The flammable metallic mixture in the panels is what made them burn away far faster than the rest of the ship. The hydrogen gas simply added fuel to the fire. I saw this in a documentary several months ago.