NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Calculator v. Slide Rule for Ex-Meridian Correction
From: Stan K
Date: 2016 Jan 3, 21:18 -0500
From: Stan K
Date: 2016 Jan 3, 21:18 -0500
And the HP41-C flew on the Space Shuttle in the 1980s.
https://hpinspace.wordpress.com/2009/07/16/hp-41-series-and-the-space-shuttle-program/
All this slide rule talk has made me look for my old units. So far I have found the two best ones:
Pickett MODEL N4-ES Vector-Type LOG LOG DUAL-BASE SPEED RULE (COPYRIGHT 1959, PATENT APPLIED FOR)
Pickett MODEL N1010-T TRIG (COPYRIGHT 1959, PATENT APPLIED FOR)
I'm embarrassed to say that all I remember how to do with them is multiply and divide, but at least I still have the books (at least for the N4-ES).
And my HP41-Cv is still alive and well, along with the magnetic card reader and thermal printer.
Stan
-----Original Message-----
From: Paul Dolkas <NoReply_Dolkas@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Jan 3, 2016 7:47 pm
Subject: [NavList] Re: Calculator v. Slide Rule for Ex-Meridian Correction
From: Paul Dolkas <NoReply_Dolkas@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Jan 3, 2016 7:47 pm
Subject: [NavList] Re: Calculator v. Slide Rule for Ex-Meridian Correction
Although I also have a soft spot in my head for slide rules (I carry a circular one around with me on my watch), I feel it’s my duty to point out that by the end of the Apollo project – the 1975 ASTP joint flight with the Russians - NASA was flying an HP 65 programmable calculator as a backup, and they ditched the slide rules.
Sorry - Paul
