You can make a good doorbell by using one of those seesaw gizmos, a pendulum on one end, and a brass bell on the other. The things tend to get out of control (eg, not oscillate nicely within a given radius, but keel, or sink too far one end, then move the other end etc) so spring loading one end is necessary (or restraining it slightly in some other manner which feeds back bled off force).
Nope; it's not perpetual motion unless you invent some way of gaining force on one stroke then reducing force required on the other stroke, but it will kick up a fine racket for 10 minutes.
Save the planet right now, stop using electric doorbels powered by nuclear power plants.
Possibly, the soundwaves count as energy, likely as not negligeable.
A bloody good PM doorbell
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nicbordeaux
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Bill_Mothershead
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re: A bloody good PM doorbell
What the heck are you talking about???
If you are looking at a web site, could you kindly share the URL.
If you are looking at a web site, could you kindly share the URL.
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nicbordeaux
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Thanks Bill for the kindly question LOL.
I'm talking about those infernal centrally pivotted seesaw devices with a pendulum, generally attributed to that guy Poponov or Milcovic or something, and described as having "two stage oscillation", which is a load of techy sounding bull to describe the natural behavior of a seesaw with a deadweight on one end, and a pendulum on the other. Googling "Milcovic double stage" should get you the goods, and enough nonesense to last you a lifetime.
A link ? In very early attempts to understand what happened under different configs (loose setups cobbled together, but useful) as in http://www.flickr.com/photos/27041895@N05/3307745628/ you will see two cannisters filled to different degrees with solid or liquid, and in this instance, two pendulums, one a 4 kg steel bar, the other a steel ball in some chicken wire. The owerweight (at rest) end being linked to a spring.
In another incarnation of these seemingly dumb devices http://www.flickr.com/photos/27041895@N05/3239201198/ you may note that one side of the seesaw has a rope running to a weight hung over a pulley wheel (in actual fact, a pulley wheel with a "OB" weight on bottom, this does the job better). The water bottles look stupid, but they do enable you to study exactly what is happening, and of course what effect a moving mass (the water) has on the system and vice versa.
With a straight pendulum, eg a bob on string hung from a rafter and set in pendular motion, runtime is 30 to 35 minutes with of course steady decay and ensuing short swing/quicker direction change/etc. My best attempts with this type of seesaw with pendulums and waterbottles or else ran to twenty five minutes, at which time it was obvious that Poponov was getting excited about nothing worthy of mention, and that free swinging pendulum actuated devices would get nowhere better than a normal simple pendulum.
So what I'm talking about is a (generally) centrally pivotted lever or rod or else with on one end a pendulum, and on the other a more "solid" (shorter hang, less travel distance = less cog shift) mass, eg a brass bell. To stop the device keeling, I use as described above a travel limit, the best in terms of simplicity/efficiencey to my knowledge being a smallish supended mass attached to a string running over a suspended from rafter pulley wheel (rather than the rocker wheel described above, quite bothersome to find the right amount of travel/size of wheel and weight combo). This small mass climbs and descends directly contrary to the end it is attached to.
Without too much mental effort or physical effort, one may build a 10 minute or more running gizmo that starts with a fearful ding ding dong ding capharneum, and ends with a pleasing tinkle, allegro ma non troppo (that's a pizza) and a piano a niente ending. Amaze your friends, scare the hell out of your pets, annoy your neighbours with Nick's Great Double Stage Pendular Doorbell, which can be set in motion from a precariously balanced state by a very light tug on a piece of string run through a hole driled in the frame of your door and apltly labelled "pull to ring".
Sorry, can't be clearer than that, been working my ass off for many many months, and no respite in view, so no time for videos or further inventions or clarifications.
I'm talking about those infernal centrally pivotted seesaw devices with a pendulum, generally attributed to that guy Poponov or Milcovic or something, and described as having "two stage oscillation", which is a load of techy sounding bull to describe the natural behavior of a seesaw with a deadweight on one end, and a pendulum on the other. Googling "Milcovic double stage" should get you the goods, and enough nonesense to last you a lifetime.
A link ? In very early attempts to understand what happened under different configs (loose setups cobbled together, but useful) as in http://www.flickr.com/photos/27041895@N05/3307745628/ you will see two cannisters filled to different degrees with solid or liquid, and in this instance, two pendulums, one a 4 kg steel bar, the other a steel ball in some chicken wire. The owerweight (at rest) end being linked to a spring.
In another incarnation of these seemingly dumb devices http://www.flickr.com/photos/27041895@N05/3239201198/ you may note that one side of the seesaw has a rope running to a weight hung over a pulley wheel (in actual fact, a pulley wheel with a "OB" weight on bottom, this does the job better). The water bottles look stupid, but they do enable you to study exactly what is happening, and of course what effect a moving mass (the water) has on the system and vice versa.
With a straight pendulum, eg a bob on string hung from a rafter and set in pendular motion, runtime is 30 to 35 minutes with of course steady decay and ensuing short swing/quicker direction change/etc. My best attempts with this type of seesaw with pendulums and waterbottles or else ran to twenty five minutes, at which time it was obvious that Poponov was getting excited about nothing worthy of mention, and that free swinging pendulum actuated devices would get nowhere better than a normal simple pendulum.
So what I'm talking about is a (generally) centrally pivotted lever or rod or else with on one end a pendulum, and on the other a more "solid" (shorter hang, less travel distance = less cog shift) mass, eg a brass bell. To stop the device keeling, I use as described above a travel limit, the best in terms of simplicity/efficiencey to my knowledge being a smallish supended mass attached to a string running over a suspended from rafter pulley wheel (rather than the rocker wheel described above, quite bothersome to find the right amount of travel/size of wheel and weight combo). This small mass climbs and descends directly contrary to the end it is attached to.
Without too much mental effort or physical effort, one may build a 10 minute or more running gizmo that starts with a fearful ding ding dong ding capharneum, and ends with a pleasing tinkle, allegro ma non troppo (that's a pizza) and a piano a niente ending. Amaze your friends, scare the hell out of your pets, annoy your neighbours with Nick's Great Double Stage Pendular Doorbell, which can be set in motion from a precariously balanced state by a very light tug on a piece of string run through a hole driled in the frame of your door and apltly labelled "pull to ring".
Sorry, can't be clearer than that, been working my ass off for many many months, and no respite in view, so no time for videos or further inventions or clarifications.
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nicbordeaux
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re: A bloody good PM doorbell
I sometimes amaze myself on reading previously written material. In this particular case, why didn't I just take a pic ?
If you think you have an overunity device, think again, there is no such thing. You might just possibly have an unexpectedly efficient device. In which case you will be abducted by MIB and threatened by aliens.
