Any idea what this is? A tool or device made by Casella of London England
Posted July 18, 2011 - 10:45 PM
I contacted Casella of London England. They don't recognize it. It's not in their references and "definitely no longer under warranty".
The box is well made with really tight box joints. The box appears to be custom-fit for the device.
The whole apparatus is about 10" long and built really strong.
A series of gears allows the black 4-wing nut on the back to spin the blades at a good speed.
The acme threads on the brass stem controls the overlap of the blades and can be turned while the blades are spinning.
On the front, there is an indication from 25% where the blades are mostly overlapped and cover about 25% of the circle to 100% where the blades are almost completely closed.
Made in England
If you've ever seen or used one of these, I'd love to know where, what and how it was used.
I emailed Casella London and received a pleasant response - but they have no idea what it is.
Posted July 18, 2011 - 11:24 PM
"definitely no longer under warranty"
Very neat piece. The company seemed to be big into wind speed measurement, does this make any breeze when turned? Wonder if it's a tester for their meters?
Posted July 19, 2011 - 04:28 AM
- motobreeder said thank you
Posted July 19, 2011 - 09:37 PM
A total guess - but I'm wondering if it measures light or shading. Just seemed to be built a bit excessive for that.
Posted July 19, 2011 - 10:19 PM
I did a little more looking, and they built some things for measuring wind velocity in mines. Anyone think of a use for underground?
Posted July 20, 2011 - 11:02 AM
Posted July 20, 2011 - 12:03 PM
...I would say it's some sort of aperture light control, but why spin it? And why by hand...
The spinning part makes sense to me in the function of a light aperture. If you've ever looked through a spinning fan, you know that you can see through it, but at a diminished quality and "brightness". The more blades the fan has, the more diminished the image that you see. That's because there is less light passing through and therefore less light for your eyes to process into an image. Perhaps it was used for viewing bright light sources or areas inside a furnace (as through a porthole) to make the light levels safer for the viewer. As to the why by hand...I can only surmise that a handheld or portable power source was impractically large or totally unavailable at the time of manufacture. These are just some ideas. I have no clue if I'm even close though LOL!
Posted July 22, 2011 - 06:09 AM