Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Add Images & Files
    Name or NavList Code:
    Email:
       
    Reply
    Re: A novel material for mirror AH ?
    From: Lewis Howell
    Date: 2019 Aug 14, 11:13 -0700

    I dont have an answer, but that rocks. I will stay tuned.
    
    I am struggling on creating a solution for night sight - the molasses and plate is not the greatest.
    
    On Wed, Aug 14, 2019, at 11:03 AM, Igor S. wrote:
    > Hello everyone,
    > As the continuation of my previous post
    > https://navlist.net/m2.aspx/Mirror-AH-safety-first-IgorS.-jul-2019-g45490 
    I've made a simple experiment and took some photos to discuss it here.
    > I deposited a thin layer of soot from oil lamp on top of float glass to
    > demonstrate the effect on the sun image. One can see a drastic
    > difference in the image of the sun from clean and darkened part of
    > glass. It allows to view the sun image in this mirror AH with
    > unprotected eyes and without horizon shades. No glare at all !
    > The same results from depositing soot on top of FSM-mirror surface. The
    > problem is that the soot does not attach permanently.
    > My question is: are there some sort of modern optical substrates
    > creating the same effect as soot in the photos? ... kind of a neutral
    > density filter (ND-filter) etc.
    > kind regards,
    > Igor
    > *File: *
    >  
    >  
    > *File: *
    >  
    >  
    > *File: *
    >  
    >  
    > 
    > 
    >
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    NavList is a community devoted to the preservation and practice of celestial navigation and other methods of traditional position-finding. We're a group of navigators, navigation enthusiasts and hobbyists, mathematicians and physicists, and historians interested in all aspects of navigation but primarily those techniques which are non-electronic.

    To post a message, if you are already signed up as a NavList member, start a new discussion or reply to any posted message and use your posting code (this is a simple low-security password assigned when you join). You may also join by posting. Your first on-topic messsage automatically makes you a member, and a posting code will be assigned and emailed to you for future posts.

    Uniquely, the NavList message boards also permit full interaction entirely by email. You can optionally receive individual posts or daily digests by email, and any member can post messages by email (bypassing the web site) by sending to our posting address which is "NavList@NavList.net". This functionality is similar to a traditional Internet mailing list: post by email, read by email, reply by email. Most members will prefer the web interface here for posting and replying to messages.

    NavList is more than an online community... more about that another day.

    © Copyright notice: please note that the rights to all messages and posts in this discussion group are held by their respective authors. No messages or text or images extracted from messages may be reproduced without the explicit consent of the message author. Email me, Frank Reed, if you have any questions.

    Join / Get NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site