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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.
Final quality of a Barometer can be determined by doing the following formulas: Average = (A + B + C) / 3.
Final quality = Floor(Average - ABS(Average - A) - ABS(Average - B) - ABS(Average - C))
Where A, B and C are the quality of the Barometric Spheres
I've verified the formula on 18 barometers. ~McArine
Requirements
Original Shard: This item becomes available once you have begun the Test of Life.
Bastet Shard: This item was added by Teppy after Test of the Ritual Tattoo was open, but before Test of Life was opened.
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) - 600 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.
Make sure your test spot is at least 10 feet above sea level, you don't want either reading to be 0.
Quality vs E
| Quality | 6AM reading | 6PM reading | E (inches) | Notes |
|---|---|---|---|---|
| 1 | ? | ? | 60 | from the T2 wiki |
| 1940 | 41' 10" (502 inches) | 33' 0" (396 inches) | 53 | T4 verified |
| 3734 | 73' 0" (864 inches) | 65' 1" (781 inches) | 47.5 | T4 verified |
| 6517 | 72' 0" (864 inches) | 66' 1" (793 inches) | 35.5 | T4 verified |
| 8007 | 71' 3" (855 inches) | 66' 10" (802 inches) | 26.5 | T4 verified |
Required By
Charcoal Brazier, Test of the Ritual Tattoo
