Dockstader Ellipse Diagram

[Bruce VoelkerdingParticipant @brucevoelkerding91659]

a question was raised in the Forum (or ME Clearing House) a few weeks ago regarding the interpretation of results from the Dockstader Valve Gear Simulator. I stumbled across this Link this morning. If you go to the attached Link and scroll to the bottom there is a Link to "Steam Locomotive Valve Gear Animation Videos". Click that and another List comes up. Click on the last item "Valve Event, Cylinder Event and Valve Ellipse Diagram Explanation".

The other items at that last list lead to YouTube videos made from the Dockstader program with the associated Ellipse Diagrams. On the Stepheson Link there is commentary on the Ellipse that gives the front & rear Cutoff Values so one can cross-check one is reading the Ellipse correctly.

Lake Forest Live Steamers Railway Museum (jghtech.com)

What I do not understand is, if you type in the "main http" name "www.jghtech.com" you don't get to the site. If all else fails try googling "Deerfield and Roundabout Railway". Click on the item "Deerfield and Roundabout Railway – IBLS" and then click on "official site".

[Bruce VoelkerdingParticipant @brucevoelkerding91659]

[Chris KaminskiParticipant @chriskaminski64716]

Thank you

[SillyOldDufferModerator @sillyoldduffer]

Useful website with good technical information ta. I've bookmarked it.

As an aside, Bruce said "What I do not understand is, if you type in the "main http" name "www.jghtech.com" you don't get to the site."

It's because the site owner hasn't followed the usual convention. If a filename isn't provided with the site URL, web-servers look for the file 'index.html', and display that. So the home page of most websites is in 'index.html', and the user doesn't have to specify it. Not the law though! Quite a few websites use a different index file, possibly as a simple way of having the server support several websites without having to register multiple DNS addresses. The DRRY site is an example: it's home page has to be fully specified as https://www.jghtech.com/html/drry-index.html

Dave

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