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Thread: Computer Technology

  1. #41
    Jac@stafford.net's Avatar
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    Re: Computer Technology

    Quote Originally Posted by barnacle View Post
    Those 9v batteries can be clipped together pole to pole in a long series, with a *serious* jolt at the end - favourite trick for baby engineers
    Old-timers may recall the electronic flash batteries that used as many as 25 to 50 9V batteries soldered in series. Singer Graflex comes to mind.

    Speaking of computer design evolution, I entered a new technological perspective in the company of several Cray engineers when they agreed that the monolithic super computer era was ending 'real soon now', and they were right.

  2. #42
    Tin Can's Avatar
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    Re: Computer Technology

    I guess Amazon won't let me take a screenshot.

    Try this link to a 1903 double glass plate of an oscillating spark.

    https://books.google.com/books?id=1O...plates&f=false

    Notice the Lord Kelvin reference!

  3. #43

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    Re: Computer Technology

    Quote Originally Posted by Randy Moe View Post
    I still test 9 volt batteries for strength with my tongue. Nobody does that anymore.
    Well, if you don't have a voltmeter handy, how else would you do it?

  4. #44
    Corran's Avatar
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    Re: Computer Technology

    Try #2 - changed out the umbrella for a large diffuser, moved the light as suggested, and decided to add a second light on the left to brighten up the background tubes. The main thing I'm a bit bummed on is the shadow on the box on the bottom center, but maybe that's just a nitpick?



    Oh - I tried to get the tube to light up after finding a 9V battery connector locally and wiring it up, but it won't stay lit for more than a few seconds and then the battery gets really hot. I think I should just leave it be...
    Last edited by Corran; 22-Mar-2020 at 20:18.
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  5. #45

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    Re: Computer Technology

    Ah, yes, the heater will take significant current, hence heating the internal resistance in the battery. Also, it occurs to me that the heaters are usually largely concealed within the cathode plate framework - probably simpler just to get some LEDs

    Neil

  6. #46

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    Re: Computer Technology

    Instead of a 9V battery you could try a small wallwart DC adapter

  7. #47
    Indiana, USA chassis's Avatar
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    Re: Computer Technology

    Looks good Bryan. From here it's a game of finesse and fractions of an inch. Where is Christopher Broadbent when we need him?

    Managing specular highlights in the glass would be my next priority, and adjusting fill to light the tube internals and boxes. The fill light can be brought towards the camera, the boxes can be angled more broadly toward the camera. For me the boxes would have a less prominent role in the image.

  8. #48
    Corran's Avatar
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    Re: Computer Technology

    Thanks chassis, this is very helpful. I obviously need practice, practice, practice, just like any other type of photography.

    I just realized this morning why the specular highlights are so wonky on the large tube and can fix that. I can adjust the boxes just a bit to get the shadow off the text. Then I might call it done and move on to a new photo. Perhaps with more practice I will revisit the tubes.
    Bryan | Blog | YouTube | Instagram
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  9. #49
    Corran's Avatar
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    Re: Computer Technology

    First photo of the new year...kinda, I shot it about an hour ago .

    Evolution of RAM

    Last edited by Corran; 22-Mar-2020 at 20:18.
    Bryan | Blog | YouTube | Instagram
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  10. #50

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    Re: Computer Technology

    Quote Originally Posted by locutus View Post
    Instead of a 9V battery you could try a small wallwart DC adapter
    Provided it's a 6 volt output. 9v with a high current capability will just blow the heater filaments, and they won't light at all.

    Neil

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