NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Cylindrical Slide Rule / tube lengths
From: Hanno Ix
Date: 2010 Jan 31, 10:39 -0800
From: Wolfgang Hasper <wolfgang.hasper@web.de>
To: NavList@fer3.com
Sent: Sun, January 31, 2010 2:37:45 AM
Subject: [NavList] Re: Cylindrical Slide Rule / tube lengths
I did some practical archeological research and
investigated the (hidden) dimensions of HR/MHR, see
attached drawing.
(The .dxf can be opened with any CAD software, if you
do not have any you can download Q-CAD here for free:
http://www.qcad.org/qcad.html)
Based on the dimensions found I ordered the tubes so we
will not need to care for the lengths later.
All those who would like to make a Bygrave, however,
can cut the tubes, the Bygrave is shorter.
I had an idea on how to make a simple locking
mechanism, shown in the upper left part of the
drawing.
It uses simple materials and can be made with a jigsaw,
no special parts needed.
It is based on a number of longitudinal cuts in the end
of the inner tube, creating a number of segments that
can be bent outwards by a disc with circular wedges on
its circumference.
I will make a sample and see what it is worth.
Thank you Gary for your plug details, this is really
good to know!
Wolfgang
From: Hanno Ix
Date: 2010 Jan 31, 10:39 -0800
Thank you, Wolfgang.
I can see the first attachment ( very nice!) but the second did not open. Any hint?
H
From: Wolfgang Hasper <wolfgang.hasper@web.de>
To: NavList@fer3.com
Sent: Sun, January 31, 2010 2:37:45 AM
Subject: [NavList] Re: Cylindrical Slide Rule / tube lengths
I did some practical archeological research and
investigated the (hidden) dimensions of HR/MHR, see
attached drawing.
(The .dxf can be opened with any CAD software, if you
do not have any you can download Q-CAD here for free:
http://www.qcad.org/qcad.html)
Based on the dimensions found I ordered the tubes so we
will not need to care for the lengths later.
All those who would like to make a Bygrave, however,
can cut the tubes, the Bygrave is shorter.
I had an idea on how to make a simple locking
mechanism, shown in the upper left part of the
drawing.
It uses simple materials and can be made with a jigsaw,
no special parts needed.
It is based on a number of longitudinal cuts in the end
of the inner tube, creating a number of segments that
can be bent outwards by a disc with circular wedges on
its circumference.
I will make a sample and see what it is worth.
Thank you Gary for your plug details, this is really
good to know!
Wolfgang
