Talk:Crown glass

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Ambiguity[edit]

"The first recorded use of crown glass in windows"

type 1 or type 2? - Omegatron 04:47, Aug 15, 2004 (UTC)

Definitely type 1 :-)

Does this "first use" apply to Britain, or is this the first window anywhere in the world? -- Petri Krohn 23:08, 10 October 2005 (UTC)[reply]

Forces in rotation[edit]

I changed the word "cetripedal" to "centrifugal" because, although it is not considered a 'true' force, it is the outward force on a spinning object. Centrifugal force is not considered a true force because it is simply caused by the inertia of a spinning coordinate system. However, just as one feels a reaction force when one pushes on an object, the centripedal force that keeps an object spinning is feeling a reaction from the object it is pushing on, this is centrifugal force. Because centrifugal force is merely a reaction force, it ceases to exist when an object is released from its circular path, so the object flies off tangent to the circle, rather than directly outward from it.

-Paul Foster 10:26, May 21, 2005 (EST)

Quantifying properties[edit]

It might be nice to include this "low" refractive index which type 2 crown glass possesses. Or the range which can be achieved, as in flint glass. It might also be nice to include the dispersion. --Joel 21:04, 3 September 2005 (UTC)[reply]