NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: help with sun sights
From: Gary LaPook
Date: 2011 Jan 16, 01:22 -0800
From: Gary LaPook
Date: 2011 Jan 16, 01:22 -0800
I just added this to my website: ---------------------------------------------------------------------- HINTS FOR MAKING YOUR BYGRAVE Print the cotan scale on photo paper. Print the cosine scale on ink jet transparency film such as 3M made"Transparency film for Ink Jet Printers," stock number CG3480. To ensure that the two scales are printed at exactly the same scale remember that the cotan scale spans two cycles while the cosine scale covers only one cycle. To test the proper scale check that the cosine scale covers exactly one half of the cotan scale. An easy way to do this is to place the right hand end of the cosine scale on any value you choose on any line of the cotan scale then check that the left hand end of cosine scale, one line up, lines up with the same value one line higher on the cotan scale. If they don't, then adjust your printer until they do. You can use plain paper for making this check, instead of the more expensive transparency sheet, by holding them up to a light. For increased durability you can seal each scale in 3M "Self-Sealing Laminating Pouches," stock number LS854-5G or -10G. When sealing the transparency sheet you must be careful to work slowly to smooth out any bubbles since the transparency sheet can trap bubbles. ----------------------------------------------------------------------------------------------------------- --- On Sat, 1/15/11, Gary LaPook <glapook@pacbell.net> wrote:
|