What is shown on these pages is not ultra high technolgy and latest science. Being more an artist than a technician myself I have to rely on simple skills and easily obtainable materials. I use straightforward craftmanship which can be accomplished by everybody who doesn't have two left thumbs. Articles are based on my own experience and - where this didn't suffice - on the help of good friends ( they know who ...). A click on the desired topic button will get you to the article. The range of topics will expand one by one as the site is growing.