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Mathematics, rightly viewed, possesses not only truth, but supreme beauty- a beauty cold and austere, without the gorgeous trappings of painting or music.

Bertrand Russell

(via spring-of-mathematics)

Rest in peace, Marie Severin. A visionary artist for Marvel and co-creator of #Spiderwoman, her work shaped comics and inspired millions.

“Spiderwoman” by ayhotte: http://bit.ly/2LG2IGT  

Leap Day…Why Does It Exist?

Once every four years, an extra calendar day is added: a leap day. But why?

The reason for adding leap days to the calendar is to align the calendar year with the actual year – which is defined by the time it takes Earth to circle the sun. It is equal to 365 days, 5 hours, 48 minutes and 46 seconds, or 365.24219 days.

If all calendar years contained exactly 365 days, they would drift from the actual year by about 1 day every 4 years. Eventually, July would occur during the northern hemisphere winter! Wouldn’t that be weird?

To correct (approximately), we add 1 day every 4 years…resulting in a leap year.

By making most years 365 days but every fourth year 366 days, the calendar year and the actual year remain more nearly in step.

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INKTOBER DAY 13 to 21!!!  #21 DRAIN #20 BREAKABLE #19 SCORCHED #18 BOTTLE #17 SWOLLEN #16 ANGULAR #15 WEAK #14 CLOCK #13 GUARDED

That’s how a revolving fan works

This gif has been circulating throughout the internet for many years, and I am not denying it It’s pretty darn cool!

Although it gets the mechanism spot on, but it misses out on one of the most amazing part of the mechanism : the oscillation itself.

How does it oscillate?

                       Source

The oscillation is simple but ingenious. So, you see that pink rod? Yeah that is attached to v - type wedge, like so:

89 is a pin. And that pin is constrained to oscillate between the two wedges. The angle of oscillation is primarily between 40-100 degrees.

It is this wedge that controls the oscillation.

Why does it oscillate?

The oscillation is due to an eccentric round cam present under the yellow gear. ( seen in animation too )

An eccentric cam

The rotation of this cam induces a torque which causes the linkage ( the pink rod ) to sweep across the plane.

Important Note

I understand that this explanation is not exactly the finest. But this mechanism has not been explored anywhere else on the Internet .This is what i could reckon of the Patent.

If you have a better explanation/sources/anything at all then please reblog it with this post, that way everyone wins. It is our humble request.

Have a good day!

Inktober days 15-21 Nickel series

King bird of paradise: Available

Northern flicker: Available

Budgerigars: Available

Green-breasted mango hummingbird: Available

Rock dove: Available

Brandt’s cormorant: Available

Greater roadrunner: Available

that is so sad alexa play ozar midrashim

Today’s doodle: Torvosaurus tanneri for some signage at Eccles Dinosaur Park. Happy #FossilFriday!

The fittest fit girls

‪From @park_kkone: “Benny and Berry❤️ Father and daughter👨‍👧💕#fatherslove‬ ‪.‬ ‪베니와 베리❤️ 아빠와 딸👨‍👧 #딸바보 베니💕” #catsofinstagram ‬ [source: https://ift.tt/2NbX0xg ]