New Jersey Scuba Diving

December 11, 2020

This Brings Back Memories

December 11, 2020

https://www.yachtworld.com/boats/1986/harker-s-island-rose-craft-2384729

Expired link - Seeker for sale again.

Only $25,000. Sounds like they blew an engine. Pity, they put a lot of work into the old girl.

I spent a lot of hours under this boat, diving and not.

Diversion II was broken up somewhere on the Chesapeake Bay years ago. Just a few dive boats left. Shops too - Dosil's closed-up this year.

Much of both boats' old websites was folded into NJScuba.net, so they're not all gone. Looks like Seeker's old domain name has been bought up and turned into spam. Alas.

Uncategorized, 12/11/20

« Update « » Still Monkeying with the 'Theme' »

Light, Air & Water

Human Vision Underwater

When light travels from a less-dense medium like air to a more-dense medium like water, the rays are refracted or bent towards the normal or perpendicular of the surface between the two mediums. In crude terms, light going from air to water will tend to be straightened, while light going from water to air will tend to be ... um ... crookeded. Confused yet? Take a look at the figure below.

refraction — ( *Tautogolabrus adspesus* )

In this figure, you can see the light rays traveling from an object in the water to your eyes, neglecting the effect of the flat glass lens of your mask. The blue lines trace the actual path of the light rays through the water and into the air, or conversely, through the air into the water - the direction really doesn't matter. As you can see, the rays are bent toward the perpendicular of the surface on the water side, and away from it on the air side.

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