Electronics - Technological Advances

How Germany Lost the Radar Race in WW2 - Binkov > . skip ad > .

Why 17 Million Telegrams Are Still Sent Every Year - Half > . 
RDF, technology - tb >> .
The Mechanical Universe - caltech >> .

Wartime Radio The Secret Listeners BBC (1979) > .

https://www.youtube.com/watch?v=RwbzV2Jx5Qo .

BBC Wood Norton & Alexandra Park

Battle of the Beams
https://www.youtube.com/watch?v=Uf5caj9ZhpQ

Search by Date
http://www.radiogoldindex.com/frame1.html
August 24, 1939
http://www.radiogoldindex.com/cgi-local/p6.cgi?DateN=19390824;Date=August%20%20%20%2024,%201939

August 28, 1939
http://pastdaily.com/2015/08/28/eyeing-pigeons-with-suspicion-august-28-1939/
September 1, 1939
http://www.teletronic.co.uk/bbcclosedown.htm

HISTORY OF THE BBC: WAR AT THE PALACE
http://www.teletronic.co.uk/herestv7.htm

Alexandra Palace Television Society - periodicals
http://www.apts.org.uk/periodical.htm .

https://en.wikipedia.org/wiki/High-frequency_direction_finding
https://en.wikipedia.org/wiki/Robert_Watson-Watt
https://en.wikipedia.org/wiki/Arnold_Wilkins
https://en.wikipedia.org/wiki/Albert_Rowe_(physicist)
https://en.wikipedia.org/wiki/Committee_for_the_Scientific_Survey_of_Air_Defence
https://en.wikipedia.org/wiki/Henry_Tizard
https://en.wikipedia.org/wiki/Frederick_Lindemann,_1st_Viscount_Cherwell
https://en.wikipedia.org/wiki/Jane_Trefusis_Forbes

RDF ..

Radio
https://youtu.be/Jth70_zH-Ps?t=32m19s
BBC Home Service
https://en.wikipedia.org/wiki/BBC_World_Service#History

BBC - Bush House - Winter 1941 to Summer 2012
https://en.wikipedia.org/wiki/Bush_House

The Vacuum Tube In Radio - 1943
https://www.youtube.com/watch?v=SoMTPzYqqxA

HOW RADIO WORKS - 1943
https://www.youtube.com/watch?v=jqGAneO79lY

Electronics: Vacuum Tubes (Valves): Triode & Multipurpose Tubes ~ 1943 US Army Training Film TF1-471
https://www.youtube.com/watch?v=04sCi50B5CY

https://en.wikipedia.org/wiki/History_of_radio
https://en.wikipedia.org/wiki/Radio
http://www.personal.psu.edu/jtk187/art2/radio.htm
http://www.explainthatstuff.com/radio.html

Secret Life Of Machines - The Radio (Full Length) > .https://www.youtube.com/watch?v=2roG4jIjvEk
Secret Life Of Machines >> .
Wireless Telegraphy >> .

A regenerative circuit is one that employs an amount of positive feedback (which is also known as regeneration or regen), that is: part of the output is fed back to the input without phase inversion, to reinforce the signal. One example is the Schmitt trigger (which is also known as a regenerative comparator), but the most common use of the term is in RF amplifiers, and especially regenerative receivers, to increase the gain of a single stage - effectively allowing an electronic signal to be amplified many times by the same active device.
https://en.wikipedia.org/wiki/Regenerative_circuit

https://en.wikipedia.org/wiki/Superheterodyne_receiver

https://www.youtube.com/watch?v=Jth70_zH-Ps

The History of Radio documentary
https://www.youtube.com/watch?v=myVGKUui55M
Radio history documentaries - playlist
https://www.youtube.com/playlist?list=PLCCBg8Rr0T3Gk5eSn1i8QocWTxlYj9cUa

S-phone
https://youtu.be/xEbkxgDIGH0?t=47m8s
https://en.wikipedia.org/wiki/S-Phone . 

London's Old Phone Boxes > .

https://www.thegreatcoursesdaily.com/radio-television-history-of-electronic-communication/
https://www.thegreatcoursesdaily.com/who-invented-radio-astronomy-a-history-of-the-radio-telescope/

Engines, Machines, Railways, Vehicles

Britain's Greatest Machines - 1910s > .
Engines - tb >> .
Machines - tb >> .
Railways - tb >> .
Vehicles - tb >> .

Evolution of Military 4x4s

Evolution of Military 4x4s > .        

Glow-worms WW1

WW1 glow-worms

During WWI, when an Allied soldier wanted to read a map or letter at night ... the usual method was to pluck up enough glow-worms to suit your particular lighting needs and put them into a jar or bottle. Though the strength of the glow tended to vary, even just a few of them was usually enough for a given soldier to read a letter or map without being too bright to risk attracting enemy fire. If you wanted brighter, you could pluck up several dozen choice specimens and have yourself a natural lantern.

As you may or may not know, the word “glow-worm” or “glowworm”, depending on where in the world you are, encompasses a vast array of different creatures. In this case, we’re specifically discussing Lampyris noctiluca, which is also known as the European glow-worm or the firefly, in this piece. But the term, “glow-worm” itself can refer to a number of species including mycetophilidae (fungus gnats), phengodidae (glowworm beetles) and rhagophthalmidae (which are also sometimes known as fireflies).

One thing all of these creatures have in common is that the way they produce light is amazingly efficient. For instance, the way fireflies and similar creatures produce light (See: How a Firefly Glows) is almost 100% efficient, meaning that exceptionally little energy is wasted doing anything but creating light, rather than, say, heat. For comparison’s sake, a standard incandescent light-bulb typically only converts about 5%-10% of the energy pumped into it into light, with the remaining being turned into heat. While LED light bulbs are becoming more and more energy efficient every year (presently as high as 80% more efficient than incandescents), they still haven’t managed to match that of the lowly glow-worm, lumen for lumen.

Glowing in the Trenches

todayifoundout.com

GPS

How The Cold War Gave Us Google Maps > .
Then This Happened - Bloom >> .

GPS - Global Positioning Systems ..