The Very First Television Shows

The Very First Television Shows

The first television sets were part electrical and part mechanical, consisting of spinning discs that replicated the action of a larger spinning disc in the studio. The first moving images - of a ventriloquist's dummy - were transmitted by Scot John Logie Baird in 1925.

In 1927 the first tv show was aired. It was a demonstration by Bell Telephone
Labs and AT&T with contributions from various executives of these companies
and a speech by the secretary of commerce, Herbert Hoover.

This was followed by many ad-hoc broadcasts from Whippany, N. J. These were
experiments and were picked up by just one tv set - at Bell Laboratories, New
York City. These broadcasts consisted of images transmitted using radio waves
and sound transmitted via cable. They were not entertainment shows - just
a few engineers and scientists testing out the new medium.

The first shows that aired to the public were those of WRGB (known officially
as W2XB but popularly known as WGY's Television). Broadcasts were
beamed locally to Schenectady, N.Y. This happened to be the home town of
television (and radio) pioneer Ernst Alexanderson. Schenectady was also the home
of just four television receivers. The early WRGB broadcasts usually consisted of a
person sitting in a chair not doing very much except the odd hand or face
movement or a drag on a cigarette. In fact, watching people smoke cigarettes
seems to have been the main feature of early tv test transmissions!

The first scheduled tv shows, and from what I can make out, the world's first
regular tv shows were farming and weather bulletins aired twice a day, 3 days
per week on WRGB. These broadcasts were simply extensions of the output of radio
station WGY. The first remote location broadcast, or outside broadcast, took
place in 1928, once again by WRGB. The subject of this broadcast was Governor Al Smith's
acceptance speech of the Democratic nomination for office President of the United States.
Due to inclement weather, the ceremony was switched from outside to an indoor
location and the short notice didn't allow enough time to test the lighting and
equipment. Hence the resulting live pictures were of poor quality. Meanwhile, in
Wheaton, Maryland, Charles Jenkins' W3XK transmitter started tests followed by
regular programs in July 1928.

These broadcasts were never really meant or designed for wide public consumption,
however, some enthusiasts managed to build crude receivers and got to enjoy the
output. Charles Jenkins' estimated that W3XK had an audience of 20,000.

Many incorrectly quote the BBC's The Man with the Flower in his Mouth from
1930 as being the first broadcast play, but it was actually The Queen's Messenger,
written by J. Harley Manners and directed by Mortimer Stewart. This was aired on
WRGB in 1928.

It must be noted that in those early days television screens were about 3
inches by 3 inches. So small, in fact, that most output consisted of a person's
upper body. "Radio with pictures" is what it was called, and that was
not far off! The images consisted of varying shades of pink or brown, depending
on the illumination used. The presenters and performers would often need to wear
dark lipstick and green makeup so that their features would not be bleached in
the extremely bright studio lights. True color television came later. The
spinning discs were eventually replaced by all-electric systems. All tv shows,
including dramas, were live to air - there was no videotape or digital recording
in those days!

These pioneering broadcasts were effectively experiments (and were licensed
as such by the federal government). Most viewers were either wealthy and curious
or were hobbyists. It is unlikely that television had any real worth as an
entertainment or information medium in these early days. The extent to which
television could expand and could be networked was severely hampered by a lack
of a national standard for telecasting. There were also many technical
difficulties not least with the revolving disc system. It wasn't until the
forties when these issues had been ironed out that tv took off in earnest.

The rest, as they say, is history, but a very rich history indeed. Have a look
at bygonetv.com and you see what I mean.


Weather Radio - The Very First Television Shows

Weather Balloon

Weather Balloon

A Weather Balloon is a high altitude balloon, which carries measuring instruments aloft to send back the information on atmospheric pressure temperature & humidity by means of small expandable measuring device called as RADISONDE.

Whenever any weather balloon is launched its always necessary to continuously monitor these conditions

WEATHER BALLOON:

Weather Balloon is made up of highly flexible latex material though chloroprene may be used chloroprene is used because as it includes UV inhibitors which retards the sun ability to weaken the balloon however it is considered to be more durable rather than latex as it is less destructible.

Weather balloons is filled with gases like hydrogen and helium but now days helium gas is more used rather than using hydrogen gas because helium gas is less hazardous though bit expensive and when balloons which are used to measure atmospheric conditions when normally released they are filled to only 10% to 20% of its original volume of balloon because due to low atmospheric pressure helium gas expands and and exerts force on the wall of balloon and as it moves in upward direction due to low atmospheric pressure helium expands and will occupy the whole volume of the balloon and it will burst after reaching upto 70000 ft of height.

RADIOSONDE:

Radiosonde is the unit, which is hanged at the lower end of the string & performs the measurement and radio transmission.

Sometimes specialized radiosondes are used for measuring particular parameters such as determining the OZONE CONCENTRATION.

Weather Balloon is used in measurement & evaluation of most upper atmospheric conditions. Information may be gathered during the vertical ascent of the balloon during his motion we can also gather information like wind movement and its speed.

HOW IT WORKS:

Initially these balloons are filled with gases like hydrogen or helium and then at the lower end of string RADIOSONDE is attached then the balloon is released. Radiosonde can be tracked by radar so we can measure wind speed & direction as it ascends through the atmosphere.

By the time it reaches the higher altitude the balloon expands as atmospheric pressure decreases and it bursts

Then radiosonde package drifts gently down the ground, which is at the end of the parachute. When data is received from radiosondes it arrives in the series of numbers. Scientists use computers to display the data in form of pictures, which is called Skew T Diagram.

This is how scientist measures our important features like pressure, temperature, wind speed & direction.


Weather Radio - Weather Balloon

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Army Sleeping Bag - Tips For Sleeping in Cold Weather

Army Sleeping Bag - Tips For Sleeping in Cold Weather

An army sleeping bag is sometimes used by sportsmen and hunters who are out in severe weather, in addition to regular army troops. These are very rugged, durable sleeping bags that have been designed to function in very cold weather. The first army sleeping bags were issued to mountain soldiers in the early 1940s. They needed to be light weight because the soldiers had to carry them with them. They also needed to be suitable for very cold conditions and the soldier had to have the ability to exit the sleeping bag quickly in case there was an emergency.

Although there have been improvements over the years, the same qualities that were needed in the 1940s are stilled needed today, which also make them a good choice for anyone who is looking for a durable sleeping bag that can perform in severe cold weather.

The current army issue is the Modular Sleeping Bag system which consists of two mummy shaped sleeping bags, the Intermediate Cold Weather and Patrol, a stuff sack and bivy cover. By combining the Intermediate and Patrol sleeping bags it can provide insulation for up to minus 30 degrees F. The Intermediate Cold Weather bag is placed inside the Patrol bag to provide more insulation. The bags are made of ripstop nylon and are water resistant. The sleeping bags also come with a double-pull reversible slider, allowing for bottom or top ventilation, and a draft flap which helps to prevent heat loss.

For the best results in cold weather, the sleeping bags can be placed on top of a sleeping mat made of polyfoam or tree boughs layered beneath the sleeping bag. This helps to prevent heat loss. The army sleeping bag is made to military specifications and is a very durable bag that hunters and sportsmen will be very happy in severe weather conditions.


Weather Radio - Army Sleeping Bag - Tips For Sleeping in Cold Weather

VHF Marine Radio

VHF Marine Radio

A VHF marine radio is an essential piece of equipment on a vessel. Very High Frequency (VHF) radios are available as a fixed mounted or a handheld portable unit to offer the best method of communicating at sea. Being in a position to contact other boaters is one sure way to enhance safety on large bodies of water. 

The usable range of a VHF transceiver is subject to various elements, such as weather, height of the antenna, and model of radio. An effective range of five to twenty miles is often witnessed.

A typical marine radio is built to a high standard, incredibly easy to operate, and able to withstand the often rough conditions at sea, such as moisture, dust, vibration and shock. Hand-held units are ideal as a back up for a stationary or fixed unit and able to cope with direct immersion. VHF sets are often cost effective communication devices, and at minimum, a vessel should have a hand held unit.

A VHF radio offers communication that is more effective and consistent reception in a marine environment than that of a mobile phone or CB radio. Boat radios have dedicated channels reserved for distress calls, and monitored by rescue services, such as the United States Coast Guard (USCG). Channel 16 is the distress channel. And a lot of receivers are able to pick up the latest weather reports, so its possible to keep up to date on conditions when boating.

These two-way communication devices are an essential component of safe boating at sea. No vessel should leave port without a VHF marine radio system onboard.


Weather Radio - VHF Marine Radio

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