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A very special thanks to Shane Connor at radmeters4u.com for this CD V-757 Barrier Shielding Demonstrator unit!
I put together a short demo video of the CD V-757 in operation and posted it on youtube.
I used my trusty aircraft turn and bank indicator as a source to get the CD V-757 to come to life.
CD V-757 Meter Unit and Speakers.
The CD V-757 demonstration set consists of a demonstration stand with Geiger detector tube and radioactive source, a Geiger counter with a small built-in public address system, a set of small speakers, a set of shielding material samples and a large light up display system. Here is the meter unit with the P.A. speakers and microphone. My set didn't have the shielding samples with it when I got it and it didn't have the radioactive source with it either. The radioactive source was large enough in these sets to have to be licensed. The sources were removed when the sets were decommissioned by FEMA. The shielding samples consisted of concrete, earth, water, wood, and lead.
CD V-757 Counter Reading Light-Up Display.
Here is a darker photo to show the light display better. This large light up display is really one of the neatest things to come out of the Civil Defense radiation instrument program. The purpose of this unit is so a large audience in an auditorium would be able to see the display during a demonstration. It operates in conjunction with the meter on the Geiger counter. The display has a green-sleeved flourescent tube behind a tape which scrolls up and down in sync the change in the Geiger counter display.