NASA Original Gemini or Mercury (pre A7L) Space Suit pressure gauge
USD $6,000.00
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This is a tested-working space suit pressure gauge from the US program.
So why is pressire indicated as an altitude? A pilot's physiology training takes place in terms of pressure altitude, not more conventional pressure units such as psi (pounds per square inch) or pa (pascal). Therefore, the pressure inside a spacesuit (or cockpit) is read-off as an altitude. Assuming the suit paired with this gauge is pressurised with pure oxygen, the limiting altitude to maintain conciousness is indicated by the warning band (on this gauge, about 40,000 feet).
There is a collection of space suits at the USAF museum at Wright Patterson AFB: the Gemini and Mercury suits in that collection have altimeters on the arm that look similar to this instrument. This differs in being a bit larger. And it's an older design than the A7L gauge .
I used to have a vacuum chamber for elementry school science demos. On a few occasions, I put this in the vacuum chamber with a beaker of warm water. The water boiled upon hitting the warning band. It's a good demo for kids and adults. Physiologically, when blood reaches the boiling point due to reduction in local atmospheric pressure, one is succeptible to nitrogen narcosis or cavitation in the blood vessles carrying blood through sensitive organs (heart, lungs,betc)
If you have more info on this gauge, please pass it along.
So why is pressire indicated as an altitude? A pilot's physiology training takes place in terms of pressure altitude, not more conventional pressure units such as psi (pounds per square inch) or pa (pascal). Therefore, the pressure inside a spacesuit (or cockpit) is read-off as an altitude. Assuming the suit paired with this gauge is pressurised with pure oxygen, the limiting altitude to maintain conciousness is indicated by the warning band (on this gauge, about 40,000 feet).
There is a collection of space suits at the USAF museum at Wright Patterson AFB: the Gemini and Mercury suits in that collection have altimeters on the arm that look similar to this instrument. This differs in being a bit larger. And it's an older design than the A7L gauge .
I used to have a vacuum chamber for elementry school science demos. On a few occasions, I put this in the vacuum chamber with a beaker of warm water. The water boiled upon hitting the warning band. It's a good demo for kids and adults. Physiologically, when blood reaches the boiling point due to reduction in local atmospheric pressure, one is succeptible to nitrogen narcosis or cavitation in the blood vessles carrying blood through sensitive organs (heart, lungs,betc)
If you have more info on this gauge, please pass it along.
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