Dean W. Armstrong

I was talking with a coworker who had a particular design problem. Her network jack was embedded in a counter and the cable ran all the way...

My long-suffering Geiger counter is now back up and running. http://www.lib.uchicago.edu/~dean/float.htm . Now, as has been pointed out, thi...

I've hesitated to comment much on the ongoing Japanese tragedy, but I wish to talk a little about the output coming out from the reactor...

Two years I made an audio stereo isolation transformer , suitable for getting rid of ground loop problems in a line-level audio connection. ...

A number of visible passes for Chicago this week: http://www.heavens-above.com/PassSummary.aspx?satid=25544&lat=41.781312&lng=-87.60...

I am starting anew! After I got a bad back moving my box camera around, I've always wanted to reinvigorate the first generation scanner...

I won't get into the long-recognized shifting of the Sun's position and the calendar with regards to the zodiacal signs--as someone ...

I got Making Things Talk as a gift from a great friend of mine and I just ran two of the projects in the "Identification" chapter...

with the Pleiades and a rising Moon.

3D printing and mobile security are two big trends to watch. The next big thing will be 3D printing. It's a hobbyist field right now, w...

The eclipse season continues, as the Moon's nodes--the intersection line of the Moon's orbital plane and the Earth's orbital pla...

In addition to causing breast cancer, light pollution has now been shown to affect the atmospheric chemistry at night in urban regions, inc...

A rare occultation of a star by the Kuiper Belt Object known as Eris was recorded in several stations in Chile and at first glance the data ...

Oh man, this is great . The radar images from last week indicated the comet was dog-boned shaped but the close-ups from the former Deep Imp...

The bright "star" next to the nearly Full Moon tonight was Jupiter, in case you were wondering.