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Barometer
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| Bulk | 1 |
| Weight | 1 |
Source
Made in a Glory Hole from 1 Glass Pipe, 1 Lead, 1 Water in Jugs, and 3 Barometric Spheres.
Barometers, like other crafted tools, have a quality associated with them. A higher quality barometer is more accurate.
Requirements
This item becomes available once you have begun the Test of Life.
Use
When carried, a new menu option becomes available under Special > Measure Altitude. This immediately reports the altitude of your current location in Main, in feet and inches.
Typical altitudes are 0 (sea level) - 300 feet (top of a tall 'mountain')
Accuracy
As in previous tales, barometers appear to report an altitude that varies according to the in-game time of day and the quality of the barometer.
The reported reading is the true altitude, plus or minus an error that follows a sine wave over the course of the game day:
t = (egypt minutes since midnight) / (24*60) reported altitude = true altitude + E * sin(2*pi*t)
E is the maximum error of the barometer, which depends in some (currently unknown) way on the barometer's quality. E is lower for higher quality barometers. In previous tales, E was about 60 inches (5 feet) for a quality 1 barometer.
All barometers are perfectly accurate at 12AM and 12PM gametime (sin(0) = sin(pi) = 0), and are most inaccurate at 6AM (too high by E inches) and 6PM (too low by E inches).
Determining E
You can find E for a given barometer by measuring the altitude of exactly the same spot at 6AM gametime, then again at 6PM gametime. Convert the readings to inches, then:
E = ((reading at 6AM) - (reading at 6PM)) / 2
It's best to use a flat area with an obvious marker to stand at, so that you can be sure you're measuring at the same spot each time.
