Main Parachute - Skydiving (gambling) and Nagel's test (medicine)

Main Parachute - Skydiving (gambling)

The primary parachute. If it doesn' t work you use your Reserve. This happens very rarely and there are Skydivers with thousands of jumps and no Reserve rides. The Main parachute is usually much higher performance than the Reserve.

Nagel's test (medicine)

Nagel's test

A test for colour vision in which the observer determines the relative amounts of red and green necessary to match spectral yellow; an instrument called Nagel's anomaloscope is used.

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