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Articles about howto

  1. Using a scanner for macro photography

    Although you wouldn’t guess it from the contents of this blog, my day job involves the design and production of products from fiber reinforced composites. A lot of my projects fall under non-disclosure agreements, so I cannot discuss them here.

    What I can do is share some of the methods I’ve developed over the years. One of those is using a desktop scanner to make close-ups.

  2. Checking links with linklint

    This website contains lots of external links. A fact of life is that hyperlinks are subject to change, so they need checking every now and then.

    In this how-to article I’ll cover how I did that for this website.

  3. Making a subset of a git repository

    Since I am in the process of making most of my programs available on github, I have been re-shuffling the some git repositories. Especially my collection of scripts (small programs for different purposes). Because some of those scripts are private, I don’t want to publish that repository as a whole.

  4. Making saline solution

    The standard recipe for saline solution is 9 grams of salt per liter of water.

    Since most people don’t have an accurate scale, we need to convert the nine grams to a volume. For that we need the bulk density of table salt. For fine table salt, the listed …

  5. Modifying a FreeBSD port

    Installing software on FreeBSD is made easier by the ports system; a collection of Makefiles and patches that contains instructions on how to build programs and libraries. E.g. building and installing the mpv media player is done in the following way:

    # cd /usr/ports/multimedia/mpv
    # make install clean …
  6. Repairing a color laserjet 2550

    Some time ago, my trusty old color laserjet 2550L more or less stopped printing, or at least I thought so. It turned out that the printer only printed in yellow. Which is not particularly useful.

    At the time I bought this printer not because I print very much, but because …


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