On 02/23/2021 12:40 PM ROBERT WYNNE <robert-wynne@...> wrote:

 

 

Anyone seen a video of a millennial attempting to use a rotary phone for the  first time without instruction? Hilarious. What we take for granted is already lost to the ages. -Best, Robert

On 02/23/2021 12:27 PM James Stone <jrs7r@...> wrote:

 

 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.

 

From: <main@ap-ug.groups.io> on behalf of "Roland Christen via groups.io" <chris1011@...>
Reply-To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Date: Tuesday, February 23, 2021 at 3:23 PM
To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

 

It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).

 

Rolando

 

 

 

-----Original Message-----
From: Pete Lardizabal <p14@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Many thanks James!

 

Read this long, long ago in a land far, far away. 

 

🤓

 

Pete

On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James

<Apochromatic triplet objective article.pdf>