Tags » Sphere

DON'T BE LEFT IN THE DARK BY MISSING BOOTH'S 17TH COOPER & FRY BOOK.

Born in Loscoe, Derbyshire, I was raised as an inner city child in Nottingham. Like my ancestors did, I escaped the noise and grime of industrial city life to the fresh air and space of the Peak District national park regularly. 845 more words

Book Review

Shape | Sphere

Cee’s black and white challenge is Shape.  Brookside is busy building a new garden.  This is going to be the centerpiece… at least that is what I assume.   73 more words

Photo

Why is the Derivative of the Volume of a Sphere Equal to the Surface Area?

This video gives an informal explanation as to why the derivative of the volume of a sphere is equal to the surface area.

VI. Calculus Videos

How To Use A Stitch Marker

For some reason, the correct way to use stitch markers totally eluded me. My frazzled beginner crochet brain just couldn’t understand it! Using a stitch marker is actually a super simple concept.  474 more words

Crochet

Today's Preview

We worked in the sphere a bit more today, first at about knee height, then at a more respectable height of 1.25 meters or so. 47 more words

Work

Calculations with a Curious Cassegrain

I continue to try to determine the foci of the apparent hyperbolic primary on the Hopewell Ealing 12inch cassegrain, which has serious optical problems.

My two given pieces of information are that the mirror has a radius of curvature (R) of 95 inches by my direct measurement, and its Schwarzschild constant of best fit,(generally indicated by the letter K)  according to FigureXP using my six sets of Couder-mask Foucault readings, is -1.112. 381 more words

Telescope Making