Periodic Table of the Elements 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. 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 Growing plants in aggregates such as sand or gravel is often preferred to the water culture method since the aggregate helps to support the roots. Figure 3. Figure 4. The solution is generally pumped to within 1 inch of the surface and then allowed to drain. Figure 5.
Surgical Scalpel Blades, Handles and Disposable Scalpels - Swann-Morton 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. Ethylene Glycol This is the active ingredient in automotive anti-freeze. The best application for this poison is to top up a half-empty liquor bottle with it and leave it where some unlucky non-White will find it. Methyl Alcohol Also known as Wood Alcohol, this substance is deadly if more than just a few mouthfuls are swallowed and medical treatment is not received soon after ingestion. Cyanide Cyanide occurs naturally in the seeds of a number of common plants. Arsenic Next
Eric's Slide Rule Site 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. 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] I = sqrt(2*P*D/(rho*H*H*H))/F [-] [unit-less] With I=2 you get maximum efficiency.