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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: recommendation for slide rule ?
From: Gary LaPook
Date: 2009 May 20, 20:17 -0700
From: Gary LaPook
Date: 2009 May 20, 20:17 -0700
Speaking of the Bygrave, I have not heard back from any of the many people who expressed interest a couple of months ago in making their own copies of it. Has anybody made one and how do you like using it? gl On May 20, 8:05�pm,wrote: > Here's 15 slide rule steps to do Bygrave. �I'd call it a tie with Gary's 16 counting his first two as really one. �The T (tangent) scale gets a little confusing at angles above 45. > > line up T with D, set cursor at d on T > move t on red S to cursor > move corsor to index on S > line up T with D, read y on T at cursor: =>y > calculate Y=y+90-Lat: �=>Y > set cursor at t on T > set index on cursor > move cursor to red y on S > move Y on red S to cursor > read red T at right D index: �=>AZ > line up T with D, move cursor to red Az on S > move index on T to cursor > move Y on T to cursor > move cursor to value at index on DI > line up T with D, read Hc on T at cursor: =>HC > > �SECcscFORMULA.xls > 24KViewDownload --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---