• Pixel-art Turbulorn, the Seeing Wraith, on a black mug with the slogan "BAD SEEING? GO REDDER."

IndexCatalogueMug

Turbulorn, the Seeing Wraith Mug

\[r_0 \propto \lambda^{6/5}\]
$21.99 USD
$21.99 USD
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Fried parameter r₀ ∝ λ6/5: seeing improves at longer wavelengths.

The joke: Observers switch to infrared when seeing is poor. The slogan on the mug reads BAD SEEING? GO REDDER.

Source: D. L. Fried, J. Opt. Soc. Am. 56, 1372 (1966).

Shipping calculated at checkout by destinationMade to order, ships in ~10 days

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingBy destination

Shipping calculated at checkout by destination.

Made to order: about 10 days of production and handling before it ships.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

Fried parameter r₀ ∝ λ⁶ᐟ⁵: seeing improves at longer wavelengths.

The joke: Observers switch to infrared when seeing is poor. The slogan on the mug reads BAD SEEING? GO REDDER.

Source: D. L. Fried, J. Opt. Soc. Am. 56, 1372 (1966).

Equations

\[r_0 \propto \lambda^{6/5}\]
SymbolMeaningUnit
\(r_0\) Fried parameter (atmospheric coherence length) \(\mathrm{m}\)
\(\lambda\) observing wavelength \(\mathrm{m}\)

Sources

  1. D. L. Fried, J. Opt. Soc. Am. 56, 1372 (1966)

Field notes

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