Re Direct reading time
Hello Bill Gottesman and all the colleges. The design of my direct reading sundial is made from find a gear with a number of teeth multiple of 24 (hours). This gear of 48 teeth, operated by a worm screw, controls the rotation of an axis parallel to the gnomon and therefore of the Earth axis rotation. The entire clock rotates around the aforementioned axis. Mainly the manufacturing was making in Aluminium by use of a mechanical lathe and a milling machine. The quadrant is a floated glass upon which a special PAPER is attached to withstand weather Board. The replacement of this paper is only required every 2 or 3 years. Now, the clock is installed in my garden; however, I am designing another sundial similar biggest and vertical commissioned by the Mayor of a village of Menorca. This instrument will be placed in a public space. --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Direct reading time.
An impressive and sophisticated mechanism as solution that (hardly) nobody asks for a problem that (hardly) nobody has. A sundial that indicates the civill time, gives you no more information than you've already on your watch. A sundial that indicates the real time, the solar time, is easy to read without corrections and gives you information that you do'nt have. Its challenge is that it incites to reflect about the difference between civil time and reall time. Willy LEENDERS Hasselt in Flanders (Belgium) www.wijzerweb.be Op 27-sep-2009, om 6:48 heeft Robert Bargalló het volgende geschreven: -- Forwarded message -- From: Robert Bargalló bargallorob...@gmail.com Date: 2009/9/17 Subject: Direct reading time. To: Robert Bargalló bargallorob...@gmail.com Hello All, When an inexperienced person examine a well constructed Sundial, often underestimate the instrument because it is not marking the official time and having to make some “antipathetic” corrections of the indicated time. That is the main reason we have built a sundial that gives civil time accurately, enough to adjust the minute a non solar clock that it has stopped. In a word, in our quadrant needless resort to the equation of time or to the local position versus the Meridian corresponding to the time zone. No arithmetic corrections are needed. Descriptively, the device is a horizontal sundial with a gnomon consisting in thin thread nylon. The mechanism presents a 48 teeth gear, powered by an endless screw, which allows the entire clock to rotate some degrees around an axis parallel to the Earth rotation axis (around the gnomon). In other words, the mobile set plays like a hypothetical sundial indicating the exact civil time is elsewhere, in another position but in the same geographic parallel. As to the accuracy, the quadrant presents marks of all the minutes from the 5 h 45 a.m. until the 8 h 15 p.m. The single need featuring the device is that one or twice a week requires adjusts a rotatable knob to indicate the current date. This disc, of course, acts on the endless screw and, for that reason, on the rotation. Really, the rotation movement compensates not only the equation of the time, but also the error caused for the geographic longitude position of the instrument. For the same method we can use the sundial giving 3 types of time: the local solar time, the standard time, or the daylight savings. Since we installed it, from November 2006 to date, it has indicated time with an error that in no case exceeded one minute. Happy Dialling! Robert Bargalló More information at next blog --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Direct reading
Dear Willy, My long experience to persons outside the sundials is as follows: A). Too complicated analemmatic figures or the necessary use of algebraic calculations to know the time that they consider the real one; for this reason, these people think the solar quadrant as an obsolete object. B). The same persons in front my sundial of direct reading increase the interest in gnomonics to consider these instruments as a “scientific precision apparatus”. Thus, direct reading encourages people towards our passion: the solar quadrants. --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Direct reading
I have to agree with Robert, who appears to have constructed an amazing instrument! Surely, there is room in this world for *two* types of sundials: (1) Those that stay true to the concept of time before mechanical clocks, when local apparent solar time was the real time, no matter what time was used anywhere else. (2) Those that include various corrections (like equation of time, local longitude versus time-zone meridian, and standard/summer time) and are intended to show exactly the same time that would be indicated by accurate civil clocks. -- Roger - Original Message - From: Robert Bargalló bargallorob...@gmail.com To: sundial@uni-koeln.de Sent: Sunday, September 27, 2009 11:57 AM Subject: Direct reading Dear Willy, My long experience to persons outside the sundials is as follows: A). Too complicated analemmatic figures or the necessary use of algebraic calculations to know the time that they consider the real one; for this reason, these people think the solar quadrant as an obsolete object. B). The same persons in front my sundial of direct reading increase the interest in gnomonics to consider these instruments as a “scientific precision apparatus”. Thus, direct reading encourages people towards our passion: the solar quadrants. --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Fwd: Direct reading time.
I like it. I would like to hear the story of how it was designed and fabricated. Is it located at a residence or a public place? -Bill Gottesman Burlington, VT Robert Bargalló wrote: -- Forwarded message -- From: Robert Bargalló bargallorob...@gmail.com Date: 2009/9/17 Subject: Direct reading time. To: Robert Bargalló bargallorob...@gmail.com Hello All, When an inexperienced person examine a well constructed Sundial, often underestimate the instrument because it is not marking the official time and having to make some “antipathetic” corrections of the indicated time. That is the main reason we have built a sundial that gives civil time accurately, enough to adjust the minute a non solar clock that it has stopped. In a word, in our quadrant needless resort to the equation of time or to the local position versus the Meridian corresponding to the time zone. No arithmetic corrections are needed. Descriptively, the device is a horizontal sundial with a gnomon consisting in thin thread nylon. The mechanism presents a 48 teeth gear, powered by an endless screw, which allows the entire clock to rotate some degrees around an axis parallel to the Earth rotation axis (around the gnomon). In other words, the mobile set plays like a hypothetical sundial indicating the exact civil time is elsewhere, in another position but in the same geographic parallel. As to the accuracy, the quadrant presents marks of all the minutes from the 5 h 45 a.m. until the 8 h 15 p.m. The single need featuring the device is that one or twice a week requires adjusts a rotatable knob to indicate the current date. This disc, of course, acts on the endless screw and, for that reason, on the rotation. Really, the rotation movement compensates not only the equation of the time, but also the error caused for the geographic longitude position of the instrument. For the same method we can use the sundial giving 3 types of time: the local solar time, the standard time, or the daylight savings. Since we installed it, from November 2006 to date, it has indicated time with an error that in no case exceeded one minute. Happy Dialling! Robert Bargalló More information at next blog --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Fwd: Direct reading time.
Bill All we need now is a good clock to control the mechanism which compensates for the EoT? Brian Albinson - Original Message - From: Bill Gottesman To: Robert Bargalló Cc: sundial@uni-koeln.de Sent: Sunday, September 27, 2009 10:24 AM Subject: Re: Fwd: Direct reading time. I like it. I would like to hear the story of how it was designed and fabricated. Is it located at a residence or a public place? -Bill Gottesman Burlington, VT Robert Bargalló wrote: -- Forwarded message -- From: Robert Bargalló bargallorob...@gmail.com Date: 2009/9/17 Subject: Direct reading time. To: Robert Bargalló bargallorob...@gmail.com Hello All, When an inexperienced person examine a well constructed Sundial, often underestimate the instrument because it is not marking the official time and having to make some “antipathetic” corrections of the indicated time. That is the main reason we have built a sundial that gives civil time accurately, enough to adjust the minute a non solar clock that it has stopped. In a word, in our quadrant needless resort to the equation of time or to the local position versus the Meridian corresponding to the time zone. No arithmetic corrections are needed. Descriptively, the device is a horizontal sundial with a gnomon consisting in thin thread nylon. The mechanism presents a 48 teeth gear, powered by an endless screw, which allows the entire clock to rotate some degrees around an axis parallel to the Earth rotation axis (around the gnomon). In other words, the mobile set plays like a hypothetical sundial indicating the exact civil time is elsewhere, in another position but in the same geographic parallel. As to the accuracy, the quadrant presents marks of all the minutes from the 5 h 45 a.m. until the 8 h 15 p.m. The single need featuring the device is that one or twice a week requires adjusts a rotatable knob to indicate the current date. This disc, of course, acts on the endless screw and, for that reason, on the rotation. Really, the rotation movement compensates not only the equation of the time, but also the error caused for the geographic longitude position of the instrument. For the same method we can use the sundial giving 3 types of time: the local solar time, the standard time, or the daylight savings. Since we installed it, from November 2006 to date, it has indicated time with an error that in no case exceeded one minute. Happy Dialling! Robert Bargalló More information at next blog --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Fwd: Direct reading time.
Use the best clock of all, the Sun (or Earth, if you prefer that new notion of Copernicus') - a photocell to track the Sun, advancing the mechanism one tick per day. Dave Bill All we need now is a good clock to control the mechanism which compensates for the EoT? Brian Albinson - Original Message - From: Bill Gottesman To: Robert Bargalló Cc: sundial@uni-koeln.de Sent: Sunday, September 27, 2009 10:24 AM Subject: Re: Fwd: Direct reading time. I like it. I would like to hear the story of how it was designed and fabricated. Is it located at a residence or a public place? -Bill Gottesman Burlington, VT Robert Bargalló wrote: -- Forwarded message -- From: Robert Bargalló bargallorob...@gmail.com Date: 2009/9/17 Subject: Direct reading time. To: Robert Bargalló bargallorob...@gmail.com Hello All, When an inexperienced person examine a well constructed Sundial, often underestimate the instrument because it is not marking the official time and having to make some antipathetic corrections of the indicated time. That is the main reason we have built a sundial that gives civil time accurately, enough to adjust the minute a non solar clock that it has stopped. In a word, in our quadrant needless resort to the equation of time or to the local position versus the Meridian corresponding to the time zone. No arithmetic corrections are needed. Descriptively, the device is a horizontal sundial with a gnomon consisting in thin thread nylon. The mechanism presents a 48 teeth gear, powered by an endless screw, which allows the entire clock to rotate some degrees around an axis parallel to the Earth rotation axis (around the gnomon). In other words, the mobile set plays like a hypothetical sundial indicating the exact civil time is elsewhere, in another position but in the same geographic parallel. As to the accuracy, the quadrant presents marks of all the minutes from the 5 h 45 a.m. until the 8 h 15 p.m. The single need featuring the device is that one or twice a week requires adjusts a rotatable knob to indicate the current date. This disc, of course, acts on the endless screw and, for that reason, on the rotation. Really, the rotation movement compensates not only the equation of the time, but also the error caused for the geographic longitude position of the instrument. For the same method we can use the sundial giving 3 types of time: the local solar time, the standard time, or the daylight savings. Since we installed it, from November 2006 to date, it has indicated time with an error that in no case exceeded one minute. Happy Dialling! Robert Bargalló More information at next blog --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
