At 06:13 +0200 N. hemisphere time on 020307 Mirjam Bruck-Cohen sent:

>hallo Bernara this sounds interesting but almost like an Urban legend ,
>mirjam
>>  roof to calibrate using the distance from the roof  to the Empire
>>  State building.
>esp this part ..

No urban legend about spider web cross hairs. They were used to make 
cross hairs for high-quality microscopes for many decades. For all I 
know some microscopes my still use them. The spider filaments are 
finer and stronger than silk.

Ron

Ron Parker noting:  Luther Burbank plant breeder par excel-
lence was born in Massachusetts on this day in 1849. Cele-
brate with a baked Burbank russet - sour cream optional
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