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More products you need for hunting season are being added to our website every day, like these Leica Geovid HD-B 3000 10×42 Rangefinding Binoculars With Ballistics. Check them out and come back often to see what new gear our vendors add.
I recently switched over from hard to digital copies. One, to save paper, and two, because I keep using up my printing quota too fast. It's great because now my desk is free of papers and my ever-growing-papers-to-read shame pile is hidden away on my Surface, but I really miss being able to doodle while I annotate.
"This AR15 was my first build and my first semi-automatic rifle. I had wanted to do an all-American sourced build for a while. After about a year and a half, I had carefully chosen and collected all the parts I needed to complete it. I had to wait a long time for some of the items, like the Magpul UBR Gen2 Stock and the Wheaton Arms Pro 3-Gun Compensator. And six months later, I was finally able to get the Leupold scope I wanted for my baby. Building this rifle gave me a lot of insight into how the AR-15 platform works - plus the pride of calling this gun truly my own."- Brownells Customer Ryan M for Sunday Gunday
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#acoustic#levitation meets #schlieren#optics: By reflecting a #sound#wave back onto itself, one can secure a standing wave if the distance between the source of the sound and the reflector is equal to an integral number of half #wavelengths. .
In this demonstration we use 28 kHz #ultrasound whose wavelength in air is 1.2 cm. Styrofoam balls of approximately 2mm in diameter can be #levitated in this standing wave at the #pressure#antinodes.
This is because the air is moving rapidly back-and-forth in the low pressure regions, thus pushing the ball into the high pressure region where the air is moving minimally. We can see the position of the balls relative to the pressure anti-nodes with the aid of our Schlieren optics set-up. .
Images employing Schlieren optics are very sensitive to changes in the density of air, and these changes refract light into the camera. The air is more dense at the pressure antinodes of the acoustic standing wave and shows up as a band of #light in the image.
Although 28 kHz is beyond the range of #human#hearing, ear #protection should be worn whenever attempting this experiment to avoid damaging #vibrations in parts of the ear.
Credit :- YT Harvard Natural Sciences Lecture Demonstrations
Part 2 of 6.
Isaac Newton was born on 4th January 1643 (New Style). The Principia was published in 1687 and is widely regarded as one of the most important scientific book ever written. Primarily because it established the convention of hypothesis>experiment>conclusion but it covers optics and the composition of light, the elliptical motion of the moon and his three laws of motion which result in the Law of Universal Gravitation. (Cont’d)
#lunar cycle #laws of Motion #the moon #optics#white Light #calculus#ellipse