Torpidai reminded me of the radiometer today and I went to the Exploratorium today to get one as it seems an excellent reminder of creativity and ingenuity.
This is what it says on the box.
The Radiometer was invented by Sir William Crookes who was awarded a patent in 1875. It consists of four vanes on a spindle that are black on one side and white on the other. When light rays strike the vanes, the black sides absorb the rays far better than the white sides, which reflect the rays.
This causes the black sides of the vanes to heat up and as the air around them warms the excited molecules of air exert pressure on the dark side. Since there is a partial vacuum inside the glass bulb, the vanes can spin very easily so they start to rotate as they are exposed to light. The brighter the light, the faster the vanes will rotate to a point where they will spin up to 3000 RPM.
My trip to the city took me to the Legion of Honor where I enjoyed the work of four Women Impressionists, Mary Cassatt, Berthe Morisot, Eva Gonzales and Marie Bracquemond. They were restricted in exploration and where they could go, so, in their painting, they "emphasize the rituals of women, who, like them, occupied a bourgeois social stature." The paintings often seemed quite intimate, many of them, and I found myself close to tears at times. I particularly appreciated Eva Gonzales two paintings, Asleep and The Awakening, one of a woman asleep and in muted colors, and the other of her still in bed but more vibrant in color, blue eyes opened wide and inviting, and curves exposed.
I also saw the Dead Sea Scrolls! Yes, actual fragments of the Dead Sea Scrolls. Amazing!!
When I parked at Crissy Field, I saw a row of wonderfully colored balls, globes, Cool Globes, an exhibit sponsored by Toyota. The globes are a treat, magnificent, inspiring, and fun.
What a city is San Francisco. Check them out:
Walking along, I noticed two red helicopters hovering by the bridge. I asked in the Warming Hut if anyone knew what was up. It seems they hover there when there is concern about security, so there is concern about opening day at the Olympics. Traffic crawled across the bridge, and then, I realized there was a peaceful protest with waving people and signs. Team Tibet!
It was foggy to the point of rain in some parts of the city today, which was refreshing and visiting a major museum, and seeing the Exploratorium filled with kids, and knowing people have the ability to protest and that artists are at work offering declarations of how we can save the planet, well, I return home, inspired.
Each Cool Globe is an example of how we can work to save our world. I see there are small steps we each can take to save our world.
Is everyone checking their tires to be sure they are inflated? Step, step, step!!