Message-Id: <1.5.4.32.19990512052500.0069dd8c@telis.org>
Date: Tue, 11 May 1999 22:25:00 -0700
To: "Pinhole Listserv" <pinhole@exploratorium.edu>
From: Rich Lohman <roaminlohman@telis.org>
Subject: Re: pinhole Doppler echo?
Hmmmmmm. Curious George....curious! You're sure the echo was coming from
the east side? I'll wait for wiser people to propose a solution.
Rich Lohman
At 05:04 PM 5/11/99 -0700, you wrote:
>One of the newer East Bay Regional Park District facilities is the
>Carquinex Straight Regional Shoreline (western unit) accessable eastward
>from Pomona Ave in Crockett.
>It includes remains of an old side-wheeler ferry boat, a new fishing
>pier and a section of the gradually increasing "Bay Trail" (the
>shoreline one not the BART-"Bay Area Ridge Trail")
>
>AmTrak wends its way along this shoreline regularly between Richmond and
>Martinez, so there's a good chance you can hear this echo. There's a
>steep canyon you can drive or walk down from the road. The train tracks
>are along the mouth of the canyon.
>What I heard from the east side of the canyon was, as the train went
>east to west, was a honk followed immediately by a honk about a half or
>whole note HIGHER. Each time the train horn honked.
>Who would like to offer an explanation?
>
>George Fosselius XTI 98
>Physics, computers, weather, hydroponics, etc at MacGregor (at risk)
>High School, Albany
>
>
>
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