83 
AND EXPERIMENTS WITH FLAT SURFACES. 
SPECULA BY HAND. 
t 1693-0 GZ 200000 | 6 
+ | 00060 | er 92100000 | 8 
= eCL-0 6 916000000 | 4 
i CZIL-0 q 967000000 | 9 
T 810-0 | ¥ #2000000 | ¢ 
4 c0-0 I 100000-0 | ¥ 
~ | 1820-0 i €000000:0 | ¢ 
T | &¢10-0 4 91000000-0 | & 
7 00-0 | “= | ¢20000000-0 | 1 
oxyano [Yur ng 
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y 
weal 
ROR cari ie z 
a x 
ce ore al ‘ 
mens 
eee eat Prem % 
sate Sa aca . 
ee ae piesa 
— _ 
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pene osc 
5 S| 
