" The Arduino Robot is the first robotics platform officially supported by Arduino.cc. It arrives fully assembled and nearly ready to run with no soldering required. Just plug in the color LCD screen, charge up the batteries (included), launch the Arduino IDE and upload the example code over the USB cable. The robot comes with a number of integrated inputs; two potentiometers, five buttons, a digital compass, five floor sensors, and an SD card reader. It also has a speaker, two motors, and a color screen as outputs, and plenty of prototyping space and TinkerKit connectors for expansion"
http://blog.makezine.com/2013/05/28/now-available-in-the-maker-shed-the-new-arduino-robot/
Showing posts with label Invenzioni. Show all posts
Showing posts with label Invenzioni. Show all posts
Thursday, 30 May 2013
Friday, 24 May 2013
After 150 years, the Stirling motor lives
The Sydney Morning Herald, 26 May, 1975
Ford Torino Stirling Special
Ford Torino Stirling Special
da
Modello matematico di motore Stirling accoppiato ad un generatore
elettrico lineare, Michele Favaron
elettrico lineare, Michele Favaron
http://tesi.cab.unipd.it/37661/1/Modello_matematico_di_motore_Stirling_accoppiato_ad_un_generatore_lineare.pdf
Motore di Stirling fatto in casa
Su YouTube cercando "motore stirling fatto in casa" trovate diversi progetti per crearvi il vostro "motore".
Wednesday, 15 May 2013
Baricole
Da "Storia e leggenda del vetro" di Paolo Mazzoldi
http://www.edscuola.it/archivio/lre/storia_del_vetro.pdf
http://www.edscuola.it/archivio/lre/storia_del_vetro.pdf
Monday, 18 March 2013
Physics and cathedrals: Flying buttress
"The aim of the Gothic architecture was to achieve light looking, vertical buildings. So they had to invent ways to handle vault pressure without heavy walls. With flying buttress it is possible to keep inner walls thin because: the flying buttress' design provides for an equal and opposite force to be imposed on the wall, thus keeping the wall in balance. This, firstly, enables the vaulted roof and, secondly, by externalising some of the structural elements of the wall, allows the wall so supported to be thinner, which in turn enables the development of large arched window sections to let in light and be filled by stained glass (source: wikipedia)."
Sunday, 23 September 2012
Tuned pendulum
This web page http://www.chcp.org/seismo.html describes the mechanism inside the ancient first seismometer (see this post) of the first century AD.
From seismo.html: "Our seismometer is intended as a demonstrator. The visitor shakes the table to simulate an earthquake. Our pendulum is "tuned" to this input. The crust of the earth absorbs the high frequency content of a quake, the signal from a distant earthquake is in the sub-audio range. In order to detect actual earthquakes the pendulum would need to be several feet in length."
From seismo.html: "Our seismometer is intended as a demonstrator. The visitor shakes the table to simulate an earthquake. Our pendulum is "tuned" to this input. The crust of the earth absorbs the high frequency content of a quake, the signal from a distant earthquake is in the sub-audio range. In order to detect actual earthquakes the pendulum would need to be several feet in length."
Saturday, 22 September 2012
The world's first seismometer was Chinese
Who was the inventor of the first siesmometer?
Zhang Heng. He was (AD 78–139) a Chinese astronomer, mathematician, inventor, geographer, cartographer, artist, poet, statesman. He lived under the Han Dynasty (AD 25–220) of China. He was a Chief Astronomer, Prefect of the Majors for Official Carriages, and then Palace Attendant at the imperial court. He invented the world's first water-powered armillary sphere, improved the inflow water clock by adding another tank and invented the world's first seismometer, which discerned the cardinal direction of an earthquake 500 km away. He improved previous Chinese calculations of the formula for pi. In addition to documenting about 2,500 stars in his extensive star catalogue. Some modern scholars have also compared his work in astronomy to that of Ptolemy (AD 86–161). (Adapted from Wiki)
A replica of an ancient Chinese Siesmograph (25-220 CE). Picture taken in July 2004 at Chabot Space & Science Center in Oakland California.
"In 132 CE, after several serious earthquakes in China, astronomer Zhang Heng invented this instrument to warn people of the next one. When the ground shook, it moved a pendulum inside the jug. The pendulum pushed a lever that opened one dragon's mouth. A ball rolled out and into the toad's mouth below, sounding an alarm. The open dragon mouth pointed in the direction of the earthquake, notifying the Emperor."http://en.wikipedia.org/wiki/File:EastHanSeismograph.JPG
Wednesday, 28 December 2011
The searchlight - 1897
In The Project Gutenberg EBook of The Great Round World and What Is Going On In It, Vol. 1, No. 15, February 18, 1897, by Various, http://www.gutenberg.org/files/15325/15325-h/15325-h.htm
we find the following news
"INVENTION AND DISCOVERY.- 1897
A New York newspaper has been making some experiments in signalling ships at night, which, if as successful as it is claimed to be, will be of the greatest service to sailors for all time to come.
Ships have a regular way of talking to one another, by means of flags arranged in certain ways...
There has been one difficulty with the flag-signals, and that has been that they were useless at night. When it became too dark for the flags to be seen, sailors had no other means of communication.
The New York paper claims to have overcome this difficulty.
In saying that ships have no means of communicating with each other, it must not be forgotten that they can use lights and send certain messages with them. But the flag system enables them to say exactly what they wish to, while through the lights they can only show where they are, and call for help in case of accident.
The invention of the searchlight set men thinking, and at last the idea struck one man that if the searchlight were turned on the flags, it ought to be perfectly possible to see them in the darkest night.
A few nights ago two tugs went down to Sandy Hook to try if the experiment would work. To their great delight they found it did answer perfectly. The tugs were stationed about a mile and a half apart, and could read with ease the messages waved across the water.
More experiments will be made, and if on further trial the method is found to be practical, a great advance will have been made in navigation...
This invention is in the nature of a powerful foghorn. It is, however, made somewhat like a musical instrument, so that different tones can be produced by it; and the idea is to have these tones arranged into a signalling code, after the fashion of the flag-signals, so that a conversation can be kept up in a similar way to that done with flags. G.H.R."
we find the following news
"INVENTION AND DISCOVERY.- 1897
A New York newspaper has been making some experiments in signalling ships at night, which, if as successful as it is claimed to be, will be of the greatest service to sailors for all time to come.
Ships have a regular way of talking to one another, by means of flags arranged in certain ways...
There has been one difficulty with the flag-signals, and that has been that they were useless at night. When it became too dark for the flags to be seen, sailors had no other means of communication.
The New York paper claims to have overcome this difficulty.
In saying that ships have no means of communicating with each other, it must not be forgotten that they can use lights and send certain messages with them. But the flag system enables them to say exactly what they wish to, while through the lights they can only show where they are, and call for help in case of accident.
The invention of the searchlight set men thinking, and at last the idea struck one man that if the searchlight were turned on the flags, it ought to be perfectly possible to see them in the darkest night.
A few nights ago two tugs went down to Sandy Hook to try if the experiment would work. To their great delight they found it did answer perfectly. The tugs were stationed about a mile and a half apart, and could read with ease the messages waved across the water.
More experiments will be made, and if on further trial the method is found to be practical, a great advance will have been made in navigation...
This invention is in the nature of a powerful foghorn. It is, however, made somewhat like a musical instrument, so that different tones can be produced by it; and the idea is to have these tones arranged into a signalling code, after the fashion of the flag-signals, so that a conversation can be kept up in a similar way to that done with flags. G.H.R."
Edison's searchlight cart, from the Smitsonian: http://americanhistory.si.edu/edison/ed_d21.htm
Of course, the use of the Morse Code is better. But we have to wait till the Aldis Lamp.
According to the Oxford Dictionary: Aldis lamp, a handheld lamp for signalling in Morse code. Origin:
First World War: named after Arthur C. W. Aldis (1878–1953), its British inventor
The Aldis Lamp is a signal lamp, a visual signaling device for optical communication (typically using Morse code). Modern signal lamps are a focused lamp which can produce a pulse of light.
Of course, the use of the Morse Code is better. But we have to wait till the Aldis Lamp.
According to the Oxford Dictionary: Aldis lamp, a handheld lamp for signalling in Morse code. Origin:
First World War: named after Arthur C. W. Aldis (1878–1953), its British inventor
The Aldis Lamp is a signal lamp, a visual signaling device for optical communication (typically using Morse code). Modern signal lamps are a focused lamp which can produce a pulse of light.
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