Friday, January 14, 2011

I'm selling the Harmony Rocket

 I've had this 60s era Harmony Rocket for years and have never touched it. This vintage guitar hung on the conference room wall at Crowley and Tripp Microphones until it was replaced with the Hofner.  The pick guard and tuners are original, and so are the pickups, and knobs. The bridge is an aftermarket bridge and has not been set up.

There is a scratch on the neck and the body that you can see in photo number 2.

The surface finish is quite nice overall, glossy, and relatively clean.

The neck looks like it is set well and the frets have no visible wear. This guitar has not been played much, if at all.

Look at the chrome on those pickups. Nice.

Click on any of the images for a closer view.

If you want to call, look at Soundwave Research, and call me during business hours.

Tuesday, January 04, 2011

FP3000B45 now available

Interesting news for users of this super high speed black and white instant pack film: The 4x5 version of it has finally reached North America and should show up online any moment.

This uses the PA-45 holder, or the Polaroid 550 large packfilm holder.

Thanks to Brandon Remler of Fujifilm USA for giving us notice that it is on its way. I certainly will get a case of it and go wild in low light with my Speed Graphics and maybe a Byron.  Aaron Muderick has been a big fan of this material in the smaller size, and has produced good looking images from the scanned negative, which has a decent tonal range.

FP3000B and FP3000B45 are descendants of my original favorite Type 47 film that I think revolutionized instant photography when it came out. Fuji has refined it to use a minuscule amount of silver in a highly amplified DTR intensification process onto an improved receiver  (though perhaps not as archival) that has a little better mid grays than the Old Pol 667.

Sunday, January 02, 2011

Acoustic Imaging uses Tiny Microphones in the Heart

IVUS, or Intravascular Ultrasound, is a catheter-delivered imaging mode that can be inserted into the body and into organs, such as the heart, or peripheral arteries, to get a cross-section view.   The images are produced by a method known as pulse-echo, where a transducer, like a very small microphone, is excited with one short tick. That produces a soundwave that propagates out, comes in contact with anything in the direction it is going, and some, often very little, of the energy is then reflected back to the same transducer which by this time has been switched over to a very sensitive preamp to listen for the incoming signal.

This process is repeated many times in a circle, like radar, and over the course of a fraction of a second, an image is built up. The image of course is not something you could actually see with your eyes - it is more like an echo map.

Shown on this series of six are some IVUS images of a beating heart. The two center images are the most interesting, as they show the heart squeezing and opening to pump blood.