hochbrechende optical glasses with brechungsindices of 1.84 - 1.87 and payment of 30 - 33 in the system sio amp; amp; darr; 2 amp; amp; darr; b amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr; 3 amp; amp; darr; alkalioxid - erdalkalioxid / zno pbo - la amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr; 3 amp; amp; darr; - their own measurements, amp; amp; darr; 2 amp; amp; darr; tio amp; amp; darr; 2 amp; amp; d arr; nb amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr; 5 amp; amp; darr;

摘要

a new optical glass with brechwerten of 1.84-1.87 and payment of 30 - 33, the preferred can be used as brillennahteilverschmelzglas comprises (in wt.%): sio 2, 7 - 11, b 2o 3 11 - 15, al 2o 3 0 - 3; alkalioxid 1.5 - 5, 6 - 20 earth and zinc oxide; la 2o 3 20 - 34, y 2o 3 0 - 7, dg 20 3 0 7, their own measurements, 2 4 - 8, tio 2 4 12 0 - 20, pbo, nb 2o 5 5 12, where 3 0 - 4, ta 2o 5 0 - 6.