"Daniel J. Stern" wrote:

On Mon, 28 Nov 2005, Sawney Beane wrote:

The bayonet bulbs I've found in Japanese and American cars require
more force. If the glass were as thin as an A19's

...it is. Thinner, in some cases.

The subject interests me and I don't know where to find glass
thicknesses listed. The glass on an A19 seems more fragile than
the glass on taillight bulbs. I suppose to be eqally strong it
would have to be thicker as a function of its size.

I *think* thinner glass is a way to reduce stresses from heating.
I *think* a bayonet bulb is likely to be subjected to more
mechanical stress when installed and removed. But I don't know how
much the British equivalent of a 100W A19 weights, and I don't know
if all American A19s weigh about 28 grams.