Changeset 287 in t29-www


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Timestamp:
Aug 16, 2012, 11:02:07 AM (7 years ago)
Author:
sven
Message:

Zusammenführung der englischen neuen Homepage mit den unterdessen veränderten Texten der englischen laufenden Homepage.

Location:
en
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59 deleted
28 edited
55 copied

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  • en

  • en/communication/measurement.php

    r286 r287  
    88    <h2>Measurement and Experimental technology</h2>
    99
    10     <p>Measurement- and Experimental technology can link Communication and Computer
     10    <p>Measurement and Experimental technology can link Communication and Computer
    1111       Technology. Measurement technology has a long history and there have been nice and
    1212       remarkable devices.</p>
     
    3030            <img src="/shared/photos/kommunikationstechnik/universalmessgeraet.jpg" alt="Fotografie des Universalmeßgerätes" width="396" height="325" />
    3131            <p class="bildtext">
    32                This is a remarkably functional, big and beautiful all-purpose measurement device made by Siemens &amp; Halske (about 1905). At that time even simple objects of utulity were made lovely detailed. This device was used as auxiliary device for morsing purposes in the national administration of the German Empire.
     32               This is a remarkably functional, big and beautiful all-purpose measurement device made by Siemens &amp; Halske (about 1905). At that time even simple objects of utility were made with lovely details. This device was used as an auxiliary device for morsing purposes in the national administration of the German Empire.
    3333            </p>
    3434      </div>
     
    7171        <img src="/shared/photos/kommunikationstechnik/loewe-kathodenstrahl.jpg" alt="Photography of the cathode ray tube" width="396" height="189" />
    7272        <p class="bildtext">
    73             At the time where there was no television and no oscilloscope yet, the
    74             <b>Cathode Ray Tube</b> was a sensation, especially at school. This was one of
    75             the very first experiments where students could see that electrons have
    76             almost no inertia, so they can be deflected easily at the presence of an
    77             electric field.
    78             <br/>This tube (with power supply on the left) from the German company
    79             <b>Loewe</b> is an historical piece from the 1930s. It measures about
    80             50&nbsp;cm!
     73            Before television and oscilloscopes, the <b>Cathode Ray Tube</b> was a sensation, especially in schools. This was one of the very first experiments where students could see that electrons have almost no inertia, so they can be deflected easily in the presence of an electric field. This tube (with power supply on the left) from the German company <b>Loewe</b> is an historical piece from the 1930s. It measures about 50 cm!
    8174        </p>
    8275   </div>
     
    8881                  <p class="bildtext">
    8982              After the currency reform in West Germany, the production
    90               of mesurement devices got going again. This AEG
     83              of mesurement devices got going again. This <b>AEG</b>
    9184              oscilloscope was built in 1949. It seems to be an exact
    9285              replica from an AEG device of the late thirties. It is
     
    9487              market at 1938. Neither the time base of the horizontal
    9588              deflection nor the amplitude of the vertical deflection
    96               are callibrated by the manufacturer. To measure
     89              are calibrated by the manufacturer. To measure
    9790              absolutely with this device, you always need reference sizes.
    9891          </p>
     
    10295          <img src="/shared/photos/kommunikationstechnik/phywe-oszi.jpg" alt="Photography of a Phywe demonstration oscilloscope" width="396" height="269" />
    10396          <p class="bildtext">
    104              The "Physikalischen Werkst&auml;tten" (<i>phsyical facilities</i>), <b>Phywe</b>,
    105              have built this small oscilloscope for demonstration purposes that can be
     97             The "Physikalischen Werkstätten" (<i>phsyical facilities</i>), <b>Phywe</b>,
     98             built this small oscilloscope for demonstration purposes. It can be
    10699             used to show the electromagnetic interaction of an electron beam in E/B fields.
    107              Since (CRT driven) television got a mass medium, these experiments
    108              were state-of-art at those days.
     100             Since (CRT driven) television was not yet a mass medium, these experiments
     101             were state-of-art in those days.
     102                         
    109103          </p>
    110104       </div>
     
    121115The Type 555 was first sold in 1963 and is a true dual-beam oscilloscope with two individual time bases. This makes it superior compared with traditional dual-channel oscilloscopes with only a single time base and an electronic chopper for the dual-channel display. <br>
    122116The 555 features a separate power supply which is sitting on the bottom of the oscilloscope cart (a scope mobile). All in all the 555 contains about 100 tubes - an extraordinary amount for such a device. As a result the power requirement of the 555 is quite high with about 1 kW.<br>
    123 The maximum signal frequency that can be displayed with the 555 is 33 MHz - an outstanding value for the time. Oscilloscopes like the 555 were normally carried from one place to another by a cart (it is next to impossible to lift such a device as a single person). Therefore the scope mobile often had storage space for additional modules that were not regularly used.<br>
    124 The 555 on display is in mint condition - a rare circumstance since most  oscilloscopes from this time show signs of their heavy duty use.<a  class="popup" href="/shared/photos/kommunikationstechnik/555.jpg"><b> A high resolution picture of the 555</b></a> can be seen here.</a><br>
    125 The Type 564 oscilloscope on the scope mobile on the right uses a bistable storage tube - a technology that was not mature at this time. These tubes were characterized by a short life time. Most notably the brightness of the display decreased rapidly with time and the maximum beam velocity for
     117The maximum signal frequency that can be displayed with the 555 is 33 MHz - an outstanding value for the time. Oscilloscopes like the 555 were normally carried from one place to another on a cart (it is next to impossible for a single person to lift such a device). Therefore the scope mobile often had storage space for additional modules that were not regularly used.<br>
     118The 555 on display is in mint condition---a rare circumstance since most  oscilloscopes from this time show signs of their heavy duty use.<a class="popup" href="/shared/photos/kommunikationstechnik/555.jpg">  <b>A high resolution picture of the 555</b></a> can be seen here.<br>
     119
     120The Type 564 oscilloscope on the scope mobile on the right uses a bistable storage tube---a technology that was not mature at this time. These tubes were characterized by a short lifetime. Most notably the brightness of the display decreased rapidly with time and the maximum beam velocity for
    126121storing images was about 500 cm/ms.<br>
    127122Below the 564 is a Tektronix Type 453 - a small oscilloscope which is quite difficult to service and repair due to its small physical size. By the way: Modern Tektronix oscilloscopes offer bandwidths up to 80GHz!
     
    135130        <p class="bildtext">This big white board is an experience system from
    136131          <b>Leybold</b> from the early 1970s. At that time, the subject
    137           "digital electonics" was taught in the school. Students could set up
    138           logic systems like binary counters, full adders, flip-flops, multiplexer,
     132          "digital electronics" was taught in schools. Students could set up
     133          logic systems like binary counters, full adders, flip-flops, multiplexers,
    139134          etc. This was quite fascinating for students at that time. Today, in ordinary
    140           schools, there is no more time for electronics in the curriculars.</p>
     135          schools, there is no more time for electronics in the curriculum.</p>
    141136    </div>
    142        
    143         <h3>The world of electronical calculating</h3> <!-- schleim... -->
     137                 
     138        <h3>The world of electronical calculating</h3>
    144139
    145140    <div class="box left clear-after">
    146141       <img src="/shared/photos/kommunikationstechnik/frequenzzaehler.jpg" alt="Photography of different frequency- and event counters" width="420" height="582" />
    147142       <p class="bildtext"><b>Calculating requires counting</b>
    148          <br/>Last but not least we show a composition of (frequency) counters from
     143         <br/>Last but not least, we show a composition of (frequency) counters from
    149144         different epoches. There are, among others, devices equipped with tubes (57
    150145         electron tubes) or discrete transistor logic (mostly germanium).
  • en/communication/television.php

    r286 r287  
    3636        <div class="bildtext">
    3737            <b>Saba Telerama</b>
    38             <p>Since 1956, the German company SABA produced projection TV-sets. The advertisements said you could even watch television in light rooms which are not shaded. This promise was exaggerated: Only with a special projection screen (made by Saba) which reflects the light primarily in one direction, you can see a sufferable image. Clicking on the picture will show you an <a href="/en/devices/saba-telereama.shtm" class="go">explanation of the Telerama projection technology.</a></p>
     38            <p>Since 1956, the German company SABA produced projection TV-sets. The advertisements said you could even watch television in light rooms which are not shaded. This promise was exaggerated: Only with a special projection screen (made by Saba) which reflects the light primarily in one direction, you can see a sufferable image. Clicking on the picture will show you an <a href="/en/devices/saba-telereama.shtm" class="go"> explanation of the Telerama projection technology.</a></p>
    3939            <p>On the right hand in the background you can see a multifunctional device made by Nordmende to see television, hear to broadcasting and gramophone records. On the left the concurrency device with the same features made by Telefunken. They are both made in 1954.</p>
    4040            </div>
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  • en/devices/saba-telerama.php

    r286 r287  
    3030  <img src="/shared/photos/kommunikationstechnik/telerama-schmitt-optik.jpg" alt="Telerama-Schmitt-Optik" width="574" height="356" />
    3131  <div class="bildtext-bildbreite" style="width: 574px;">
    32       <p>The <b>Schmitt lenses</b>, demounted from the Saba Telerama projection TV-set.
     32      <p>The <b>Schmitt lenses</b>, as used in the Saba Telerama projection TV-set.
    3333  </div>
    3434</div>
    3535
    3636<p>
    37          The CRT (6&nbsp;cm diameter) is partly visible in the pice. The light
    38          coming from this tube caroms on the concave mirror (in the picture laying on
    39          the floor). Afterwards it is adjusted by an special lens (on the right of the
    40          box) and leaves the box, arriving at the projection screen.
    41          <br />During this long way the original picture which is about
    42          4,5cm&nbsp;x&nbsp;3,5cm big is scaled up to 123cm&nbsp;x&nbsp;97,5cm on the
    43          projection screen. Consequently, the luminosity is decreasing enormously.
    44          If you compute the final fraction of the original luminosity, you'll
    45          understand, why this projection TV had to be set in a totally shaded room.</p>
     37         The CRT (6 cm diameter) is partly visible in the picture. The light coming from this tube reflects on to the concave mirror (on the floor). The reflected light is adjusted by a special lens (on the right of the box) and leaves the assembly, arriving at the projection screen. During this process, the original picture, about 4,5cm x 3,5cm, is scaled up to 123cm x 97,5cm on the projection screen. Consequently, the luminosity is reduced enormously. Consequently, this projection TV needed to be viewed in an almost totally shaded room.</p>
    4638</p>
    4739
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  • en/index.php

    r286 r287  
    1515               <li>In contrast to similar museums that normally only exhibit
    1616                   the history of technology without showing their functionality,
    17                    almost all devices in the technikum29 are operative and are
     17                   almost all devices in the technikum29 are operational and are
    1818                   demonstrated during the guided tours. So you get a totally
    1919                   different picture of that time. This is quite absolutely
     
    5555            <h2>Opening hours</h2>
    5656            <ul>
    57                 <li>We currently accept only group registrations (at least 5
    58                     persons). Dating requests are accepted until five days
    59                     before the favored date.</li>
     57                       
     58                <li>We currently accept only group bookings (at least 8 people). Requests are accepted until five days before the favored date. </li>
    6059                </li>
    6160            </ul>
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