From cube-lovers-errors@mc.lcs.mit.edu Fri Mar 26 18:37:05 1999 Return-Path: Received: from sun28.aic.nrl.navy.mil (sun28.aic.nrl.navy.mil [132.250.84.38]) by mc.lcs.mit.edu (8.9.1a/8.9.1-mod) with SMTP id SAA12529 for ; Fri, 26 Mar 1999 18:37:05 -0500 (EST) Precedence: bulk Errors-To: cube-lovers-errors@mc.lcs.mit.edu Date: Fri, 26 Mar 1999 03:46:13 -0500 (EST) From: Nicholas Bodley To: David Singmaster Cc: jbryan@pstcc.cc.tn.us, cube-lovers@ai.mit.edu Subject: Colors under Na vapor lamps (Was: RE: Re : RE: parity pairs) In-Reply-To: <009D5A93.46B93D17.11@ice.sbu.ac.uk> Message-Id: On Thu, 25 Mar 1999, David Singmaster wrote: } If one really wants trouble with cube colors being indistinguishable }try solving under a sodium vapor street lamp. I found this gave two colors: }grey and greyer! Here in the northeastern US, high-pressure sodium (Na) vapor lamps are common; they have a much broader spectrum that the essentially monochromatic low-pressure lamps. The latter are rather strange! They're also more efficient, I'm fairly sure. I haven't looked at a cube under the h.p. lamps, though. |* Nicholas Bodley *|* Autodidact & Polymath * Electronic Tech. (ret.) |* Waltham, Mass. *|* ----------------------------------------------- |* nbodley@tiac.net *|* |* Amateur musician *|*