youtube

[Mark]

An interesting make-and-brake device using a kind of Leidenfrost effect/intermittant bubble insulation to pulse the coil. Maybe some "hot and cold" fluctuation in resistance of the platinum wire comes into play as well.
Large induction coil with Wehnelt interrupter
http://www.youtube.com/watch?v=m87-paje-ZI

[Mark]

Wabbler fence charger
http://www.youtube.com/watch?v=BQbFCQiCHMY

Electric fence experiment ends as expected (original) HD
http://www.youtube.com/watch?v=MALu5Gmqy18

[Mark]

A Stirling Engine built from a cookie tin
http://www.youtube.com/watch?v=ViqQ1YXCpHY

[Mark]

Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation]
http://www.youtube.com/watch?v=odJxJRAxdFU
Whoa: Watch Scientists Use Sound Waves to Make Things Levitate
http://www.wired.com/design/2014/01/who ... und-waves/

[Mark]

Sun imaging ISON and EASIEST Schlieren photography Dan's Version SOLAR TELESCOPE
http://www.youtube.com/watch?v=u0aClpzytt8

Jam Jar Pulse Jet Schlieren
http://www.youtube.com/watch?v=q1LQ94pjUWE

[Mark]

Fast & Scalded: Capillary Leidenfrost Droplets on micro-Ratchets
http://www.youtube.com/watch?v=CS0c05WQ_js

[Mark]

The colors kind of add to the effect. Nice simple table experiment.
Cymatic Experiments on Harmonics, atomic alignment & sacred geometry
http://www.youtube.com/watch?v=IvKt9dfxHNI#t=4m36s

[Mark]

Not a good place if the jar cracks do you think?
JB2 In Science Now. The Pulse Jet Engine!
http://www.youtube.com/watch?v=3iAKbzjVYps#t=4m

[Mark]

Steel instead of sand
The Hourglass
http://vimeo.com/22396483

[Mark]

Interesting design
Big sparks from a handheld electrophorus
http://www.youtube.com/watch?v=axgG_aSLKPM
http://www.rmax.com/wall-r-matte-plus3.asp

"One of the largest examples of an electrophorus was built in 1777 by German scientist Georg Christoph Lichtenberg.[7] It was 6 feet (2 m) in diameter, with the metal plate raised and lowered using a pulley system. It could reportedly produce 15 inch (38 cm) sparks."
http://en.wikipedia.org/wiki/Electrophorus

[Mark]

[quote="Mark"]Interesting design
Big sparks from a handheld electrophorus
http://www.youtube.com/watch?v=axgG_aSLKPM
http://www.rmax.com/wall-r-matte-plus3.asp

I was curious about the price of those panels. I wonder how two panels hooked together would work as an 8 foot X 8 foot electrophorus? That would be ~4 times more surface area than the above video and you would need to be very careful and stand a good distance away from it so as not to get shocked/electrocuted or worse perhaps.
http://www.homedepot.com/p/t/100317820? ... =100317820#

[Mark]

Ball Bearing Motor - How to Make/How it Works
http://www.youtube.com/watch?v=DjKhggNJGls

RimstarOrg4 days ago
"Yes, it works on DC as well. Some use batteries directly connected to the motor to run it. The explanation I gave in this video is just the most popular one. I've given a link in the video description to abstracts of papers that provide some other explanations."

[Mark]

A few articles on the ball bearing motor.
http://appliedmechanics.asmedigitalcoll ... id=1398258

I liked this design and color photograph showing a vise to hold the ball bearing.
http://www.beinsa.info/index.php?option ... &Itemid=30

http://www.eleceng.adelaide.edu.au/pers ... en1999.pdf

http://en.wikipedia.org/wiki/Ball_bearing_motor

[Mark]

The fourth harmonic and Sibelius
http://iopscience.iop.org/0031-9120/49/2/149

[Mark]

I liked the smoke test.
How to Move Things with Sound/Acoustic Propulsion
https://www.youtube.com/watch?v=L5fVFA2sWt4