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Difference between revisions of "Barometer"
(New page: {{Template:ItemInfo|weight=1|bulk=1|image=Bag.png|description=A tool used to measure altitude.}} ==Source== Made in a Glory Hole from 1 requires::Glass Pipe, 1 [[requires::Lead]...) |
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reported altitude = true altitude + E * sin(2*pi*t) | 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 | + | E is the maximum error of the barometer, which depends in some (currently unknown) way on the barometer's quality. E is smaller for higher quality barometers. |
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). | 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). | ||
| Line 35: | Line 35: | ||
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. | 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. | ||
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| + | ===Quality vs E=== | ||
| + | |||
| + | {| border="1" cellspacing="0" cellpadding="5" | ||
| + | ! Quality !! E (inches) !! Notes | ||
| + | |- | ||
| + | | 1 || 60 || from the T2 wiki | ||
| + | |- | ||
| + | | 1940 || 53 || T4 verified | ||
| + | |} | ||
| + | |||
{{RequiredBy}} | {{RequiredBy}} | ||
Revision as of 14:14, 16 May 2009
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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 smaller for higher quality barometers.
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.
Quality vs E
| Quality | E (inches) | Notes |
|---|---|---|
| 1 | 60 | from the T2 wiki |
| 1940 | 53 | T4 verified |
