Re: ATM [Fwd: Micromètre de Huygens]

["B. Pepin" <atmjedit@conceptsnet.com>]

Hi,

Maybe this will be helpful.

Huyghen's micrometer was not an original idea. It was derived via the work
of Yorkshire amateur Gascoigne through his friend Jeremiah Horrocks.
Horrocks' work, based on Gascoigne's filar micrometer, is included in the
appendix to Hevelius's _Mercurius in Sole Visus_, 1662, and Horrocks'
_Jeremiae Horrocci Opera Posthuma_, published by Whatton in 1678. Huyghen's
version using a type of "wedge" in conjunction with a wire was published in
full in his _Systema Saturnium_ in 1659. This includes diagrams of the
device that would be helpful for construction.

Barlow Pepin


----- Original Message -----
From: Glen Youman <gleny@starstream.net>
To: <atm@shore.net>
Sent: Thursday, September 21, 2000 5:10 PM
Subject: ATM [Fwd: Micromètre de Huygens]


> -------- Original Message --------
> Subject: Micromètre de Huygens
> Date: Fri, 22 Sep 2000 00:49:36 -0000
> From: "Jean Pierre Martinez" <jpmartapa@easynet.fr>
> Organization: [Posted via] Easynet France
> Newsgroups: alt.binaries.pictures.astro
>
> Hello all,
>
> I seek to reproduce the micrometer whose Huygens was useful and I do
> not manage to find the plans of assembly or the diagrams as well as
> the algorythme that it used to convert its angular measurements
> (position and separation).  If there are among you an observer or a
> collector these elements would be it enough pleasant for me has to
> communicate them.
>
>
> Astronomicalement
>
> Jean Pierre Martinez
> jpmartapa@easynet.fr
> http://www.astronmythe.com
> http://www.promo-web.net/cgi-bin/comm/pub.cgi?id=platon
>