• Stephen Biss

Contraction Chamber Separation

Tip 13: Is there a mercury separation in the lower contraction chamber of the #duisimulator NIST thermometer that police noticed or should have noticed? Using FOI, disclosure, O'Connor, and cross-examination, watch for notes of mercury gaps and their repair. According to at least one CFS scientist, Dr. Langille, QTs are trained to watch for such gaps (R. v. KG, May 21, 2013 at Kitchener, page 5) :

A. ...unless it’s broken it – it will continue to act. There’s no way for it to go out of calibration.

Q. Sure. Unless it’s been dropped or if somebody pulls it out of a plastic tube and it hits the desk and separates something like that. And qualified technicians are used to using mercury thermometers are familiar with this and are trained to watch for such gaps?

A. Yes.

Both Guth (in the 2100 Operation Manual) and the Canadian distributor, DavTech, (in an enclosure with the sale of a new NIST thermometer) provide police with instructions for rejoining mercury separations in glass thermometers, specifically "Separation at the Upper Portion of Mercury Column", "Separation in the Contraction Chamber", and "Separation in the Lower and Middle Portion of the Column". An astute defence lawyer may wish to cross-examine a QT as to their proficiency in identifying such separations and their repair.

#thermometer #mercuryseparation #tip

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