Archived posting to the Leica Users Group, 2002/03/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Europeons use the comma instead of the decimal point in numbers. At least it is a common thing to see. Suggest 10,000 metric Tonnes is really 10.000 Tonnes , which is 10,000 KG or 22,000 pounds of glass. This is more consistent with the making of 10,000 -30,000 lenses per year.....rather than 1000 times that amount. The Math: Figure a lens is half glass, half metal. Average of say 300g ( 3/4 of a pound of lens) .... then this becomes 3/8 pound of glass per lens. Say they grind off 1/3 of the glass. That would say the gross amount of glass per lens is 5/11 of a pound ... times 11,000 lenses ( make the math easy) is 5,000 pounds of glass per 10,000 lenses... Using that number, and figuring 30,000 lenses per year ( assume this to be correct as we do have some lens quantity figures) and you get 15,000 pounds of glass.....Looks about right for the quantity of glass they claim to consume in a year... 10 Metric Tonnes. BTW< we have nothing in here about binoculars, that could be much more then photographic lens volumes...... Interesting figures, absolutely useless information unless you are int he glass supply business! Frank Filippone red735i@earthlink.net - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html