Mechanical Music Digest - Tech. Ising's Formula How big a mouth in a flue pipe? I had the luck to stumble on the wisdom of Hartmuth Ising (1971) when my interest in pipes started some 20 years ago. He did a lot of research on the jet mechanism in the flue pipe, including flow visualizations. This particular work was published in German in an extremely arcane publication. So it is no wonder it is never cited and probably not even known by all that should. Among other things it tells how to select the proper dimensions in the mouth area and how to estimate the sound power. First the dimensions and constants we are talking about: H [m] is the height of the cut-up, the distance the air jet travels across the mouth. You can use other consistent unit systems than SI, for instance cgs, but beware of peculiar additional constants if you try to drag in any inches.
The first simple basic relation is Bernoulli's law which tells you that V = sqrt(2*P/rho) [m/s] From this you immediately find the air consumption rate Q = V*W*D [m^3/s] The Universe within 5000 Light Years - The Orion Arm. Eric's Slide Rule Site. Scientific and technical books of yesteryear. Poisons. Poisons All preparation and handling of toxic substances must be conducted with great care. Work in a well-ventilated area, wear gloves, goggles and a respirator. The operative and those assisting can become poisoned by, fumes, dust, contacting toxins and dusts with bare skin or mucous membranes. Be Very Cautious! I haven't provided much information on identifying the plants or mushrooms required for making some of these poisons because detailed information on this subject is widely available in books and on the internet.
There are dozens of other toxins which the operative could produce or obtain but I have chosen to include only the most basic ones which are readily available (Cobra or pufferfish toxin may be very deadly but how are you going to obtain some without going to lengths which make it impractical?). Ethylene Glycol This is the active ingredient in automotive anti-freeze.
Methyl Alcohol Cyanide Cyanide occurs naturally in the seeds of a number of common plants. Arsenic Belladonna. The Project Apollo Archive. Surgical Scalpel Blades, Handles and Disposable Scalpels - Swann-Morton. American Science & Surplus : Items Just Off the Truck. An Atlas of The Universe. Hydroponic Systems. Water Culture or Aquaculture Aggregate Culture Aeroponics Continuous Flow Systems Water Culture or Aquaculture The water culture method of hydroponics is the simplest to set up on a small scale. In this system the plant roots are totally immersed in a nutrient solution. The major disadvantages of this system are the large amount of water required per plant and the need to aerate the solution continuously. The actual design of the system is limited only by the imagination of the builder. A standard tray or tank is shown in Figure 1.
You can make a small system from a child's wading pool, a plastic pail, a fish tank, or a drinking tumbler. Figure 1. Short plants such as lettuce and spinach will usually support themselves. Figure 2. Vining plants such as cucumbers and tomatoes must be supported by string. Change the nutrient solution every two weeks when the plants are small and once a week as they begin to mature.
Aggregate Culture Figure 3. Figure 4. Figure 5. Figure 6. Aeroponics Figure 7.