Jon Noring wrote re standard time heliochronometers: << I'm especially intrigued to know of designs that do not require any alignment interaction nor adding or subtracting minutes to compensate for the EoT>>
Jon, I have several so called heliochronometers, in particular I have a Pilkington Gibbs and a Schmoyer - though both are, sadly or gladly, according to your point of view, "interactive". I do have one "non-interactive" one - an equinoctial made by Silas Higgon. It uses two interchangeable specially shaped gnomons, one for use when the sun is travelling south, and the other for when it is heading back in my direction. Adjustment is required on four days a year - at each solstice, and when the clocks change. It's not too onerous. There are two photos of it - the first two pictures in the "Picture Gallery" section of my web page, with a link to Silas' web page. Chris Lusby Taylor designed a dial which will put the dial forwards and backwards when the clocks change (also on the site), but won't deal with the EoT. See the second page of the "Picture Gallery" link. There are also sections on the Pilkington Gibbs and Schmoyer as well if you are interested. Dials with analemmas also give standard time of course, but only at specific moments during the day - see the Harriet James dial for an example. Mike Shaw mailto:[EMAIL PROTECTED] http://homepage.ntlworld.com/jmikeshaw/ N 53º 21' 24" W 03º 01' 47" Wirral, UK. -
