Chris, I apologize for misreading your tone and intent. It's an unfortunate = attribute of email that it loses personality. I agree that a school = purchasing an instrument for instruction should have a high quality but = I don't see that our schools are at that point or that caveman is = recommending this as a school solution. =20 Let me try to explain my sensitivity. My son's middle school dropped = earth science to meet state mandates for an increase in physical = education hours. We moved shortly after that to another state. Here I = became involved with the science fair and to my shock the largest middle = school in the region did not participate. When I inquired I found no = contract for extra work outside the classroom hours so no science = projects. One high school science teacher explained to me that there is = no time to fit any extra topics in order to meet federal and state = curriculum guidelines. The one teacher that did let me demonstrate a = seismograph left the area and her job was cut. A German exchange = student I am hosting is near the top of the English class and shows = better understanding than most others according to her teacher. She has = only been in the US since August so what does that tell you. Our = political mandates are dumbing down the best students. It really is = approved and budgeted science only and that leaves only individual = interest. An old magazine article from 1960 something about a smoked drum = seismograph stuck in my mind until I started to research in 1995 and = build my first. The Lehman article has been the basis for many on this = list but few of us are using pipe fittings on a board anymore. Maybe = something simple like the caveman web page will spark other individual = interest. How well it functions doesn't matter if thinking is set in = motion and the steps to reach something better follow. That's where = learning starts. Think about what percent of aeronautical engineers = started with paper airplanes looping into the ground and being refolded? = RandyChris,I apologize for misreading your tone = and=20 intent. It's an unfortunate attribute of email that it loses=20 personality. I agree that a school purchasing an instrument for=20 instruction should have a high quality but I don't see that our=20 schools are at that point or that caveman is recommending this as a = school=20 solution.Let me try to explain my = sensitivity. My=20 son's middle school dropped earth science to meet state mandates for an = increase=20 in physical education hours. We moved shortly after that = to another=20 state. Here I became involved with the science fair and to my = shock the=20 largest middle school in the region did not participate. When I = inquired I=20 found no contract for extra work outside the classroom hours so no = science=20 projects. One high school science teacher explained to me that there is no time to fit any extra = topics in=20 order to meet federal and state curriculum guidelines. The one = teacher=20 that did let me demonstrate a seismograph left the area = and her job=20 was cut. A German exchange student I am hosting is near the = top of=20 the English class and shows better understanding than most others = according to=20 her teacher. She has only been in the US since August so = what=20 does that tell you. Our political mandates are dumbing down the = best=20 students. It really is = approved and=20 budgeted science only and that leaves only individual = interest.An old magazine article from 1960 = something=20 about a smoked drum seismograph stuck in my mind until I started to = research in=20 1995 and build my first. The Lehman article has been the basis for = many on=20 this list but few of us are using pipe fittings on a board = anymore. Maybe=20 something simple like the caveman web page will spark other = individual=20 interest. How well it functions doesn't matter = if thinking is=20 set in motion and the steps to reach something better=20 follow. That's where learning starts. Think about what = percent=20 of aeronautical engineers started with paper airplanes looping into the = ground=20 and being refolded?Randy