Profile cover photo
Profile photo
Michael Umbricht
114 followers -
Ladd Observatory Curator
Ladd Observatory Curator

114 followers
About
Posts

Post is pinned.Post has attachment

Post has attachment
A Honeyweel 6080 mainframe computer was used at NORAD to track satellites during the 1970s. The orbital elements of each spacecraft were entered using punch cards.
Add a comment...

Post has attachment
Amateur radio and visual observations of the Sputnik satellites by Prof. Charles Smiley at +Ladd Observatory in the late 1950s.
Add a comment...

Post has attachment
The Lonsdale High School telescope and education philosophy in Rhode Island during the 1860s.
Add a comment...

Post has attachment
Tracking Sputnik satellites via ham radio at +Ladd Observatory in Providence.

Post has attachment
The DEC Professional 300 series and VAX-11/750 FAQs have been recently updated. I contributed to, or maintained these, back in the 90s and I've since uploaded them to Wikiversity, a Wikipedia affiliated project, where they can now be edited by anyone.

https://en.wikiversity.org/wiki/Retrocomputing

Post has attachment
I've been working with students from +Brown Space Engineering on a 70cm #hamradio for a cubesat scheduled for launch by NASA in the spring.
Photo
Photo
10/1/17
2 Photos - View album
Add a comment...

Post has shared content
Ladd Observatory is on the second highest point in Providence, a site that was once referred to as Tin-top (or sometimes Tin Tops Hill.) Anecdotes describing the origin of this name are frequently given. For example, an article in the Providence Journal states that “Before the observatory was built in 1891, this land was known as Tin Top Hill because it was a dumping ground for tin cans.” However, the name may have more to do with a carefully placed, but misunderstood and then forgotten, surveying aid.

Learn more about the tin cone hanging in a tree on the summit of Tin-top Hill, the site of Ladd Observatory.
Add a comment...

Post has attachment
I'm restoring a "crow's foot" gravity cell which powered the telegraph system for sending time signals at +Ladd Observatory. Before and after cleanup. Copper sulphate, or blue vitriol, crystals are dissolved in water to make the electrolyte. Info on this type of battery at: http://w1tp.com/mbatt.htm
PhotoPhotoPhoto
3/26/17
3 Photos - View album
Add a comment...

Post has attachment
Slides from my presentation at Providence Radio Association W1OP about the Rhode Island AREDN mesh network on now online. Metropolitan area wireless networking via amateur radio.

http://thuban.physics.brown.edu/mesh/aredn-ri.pdf
Photo
Add a comment...
Wait while more posts are being loaded