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340 results found
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displaying 157-159 |
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| Gold from sea water (new technique) 
Sea water contains about 0.1-2 mg/tonne of gold dissolved in water (average 1 mg/tonne). But considering the amount of seawater available, it is a really huge goldmine! Theoretically fine, but problems were practical (which prevented profitable extraction till now). This can however become possible with the old electrolysis technique, with the only difference that the voltage difference between the electrodes must be maintained slightly less than the minimum potential difference required for electrolysis of water (yes, there is a minimum pot. difference, say 1.48 volts, below which water won't be hydrolysed. But since gold lies below hydrogen in electrochemical series, it will get deposited on the cathode!). Since it is impractical to pump millions of gallons of water, it is more practical to move the electrodes over vast regions of oceans.With a slight modification, the propellors of ships can be designed to form the electrodes! Each of the 3 blades will be a stack of 3 blades (like a sandwich) with the sandwiched blade maintained +ve and the other two forming cathode (of course they won't be touching each other. There will be a gap of a few cm between each blade, supported by rubber/cork). The tilt of each blades will be much less than conventional propellor, so that it makes much more revolution per advancement, and hence scan the volume of water more effectively. It is practical to make each blade 1.7 metre in length, so that cross sectional area of circle formed on revolution of blades will be 10 metre square. This will scan 10 tonne of water per 1 metre moved by the ship. Considering that efficiency of extraction is only 0.1 mg/tonne, it comes to 1 mg/metre of distance covered (or 1 gram per k.m. or 1 k.g gold per 1000 k.m.) So, this may not be profitable if ship is designed only for gold hunt. But it can be a real bonus for commercial ships which has to cover thousands of k.m. anyway.Reward: calculate it yourself (please consider this idea, it is an earnest appeal. I require your help. At least you can forward this idea to more people). 
There are 9 replies to this idea
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| Secret rumour-spreading organisation
An organisation funded and manned by volunteers would be set up with the sole purpose of spreading rumours. Several hundred normal citizens would be recruited, each putting in arround $10. Letters would be sent to editors of newspapers, radio hosts, webmasters and other media outlets. When enough people with the right skills have been recruited, a large meeting will take place, and a rumour will be decided on. Everyone will be given a role in the hoax. Some will be eye witnesess. Others will bombard blogs and forums with claims. And others would write stories for their newspaper, or have discussions on radio. A homemade "documentary" would be made and circulated on the internet, or even on mainstream TV. Only the managers of the organisation would know how the hoax is going to be told, and what developments will be "discovered". They will be the ones who decide when the time has come to tell the world about the hoax. They will not reveal everything, and not name the organisation (or even admit that it exists), because soon, the time will be ripe for another enoromous hoax.Reward: to be the leader of the organisation
There are 4 replies to this idea
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| Automatic Stop Disc Brakes On All Saws
When you saw wood, metal or other materials with any tool (skill saw, band saw, table saw, saber saw, and other bladed cutting tools) if that tool is not a standard chain saw then the blade always will continue to dangerously spin after the cut is made. There is only the protection of guards that slowly close behind the material you are cutting. This means that if the guard fails (and they often do due to sticky or jammed guards etc.) then you can seriously hurt yourself. If we place disc brakes when the power is shut off, the trigger is released then the saw will come to a complete stop. As of today's saws none come with a braking system.Another type of braking system that would also solve this dilemma are called "Jake Brakes" which simply means the brake is held apart until the power shuts off then they close on either side, but this requires hydrolics, but is still feasable.Reward: To save lives.
There are 2 replies to this idea
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