Re: WHat are those holes for?

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Article #19465

#19465

From: Richard Rosenthal
Date: Wed, 20 Jul 1988 12:49

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Re: Man Hole Covers

Triangular (3 sided) covers cannot fall through the hole.

Nashua, New Hampshire has such covers.  They are placed in the
street such that one of the points of the cover points down hill.
Maintenance crews at the surface always know which way the system flows.
-- 
Richard Rosenthal                 Internet:  richr@ai.etl.army.mil
Engineer Topographic Labs             UUCP:  ...!ames!ai.etl.army.mil!richr
Ft. Belvoir, VA 22060-5546          BITNET:  richr%ai.etl.army.mil@CUNYVM
+1 202 355 2830                      CSNET:  richr%ai.etl.army.mil@RELAY.CS.NET

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!ai.etl.army.mil!richr
From: richr@ai.etl.army.mil (Richard Rosenthal)
Newsgroups: sci.electronics
Subject: Re: WHat are those holes for?
Message-ID: <134@ai.etl.army.mil>
Date: 20 Jul 88 12:49:31 GMT
References: <10790@oberon.USC.EDU> <327@richp1.UUCP> <303@btree.uucp> <1550@tekirl.TEK.COM>
Reply-To: richr@ai.etl.army.mil (Richard Rosenthal)
Organization: USAETL, Fort Belvoir, Virginia
Lines: 11

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