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L. CASELLA'S CATALOGUE 



1416. MICROMETER, on gkss, divided to parts of inches or in millimetres 12 6 



1417. Parallel Wire Micrometers, 3 3s. Od., 4 10s. Od., and . 6 10 



1418. with position circles, 4 10s. Od., 6 10s. 6d., 



The cheaper of the above glasses are generally of rather longer focus than those named. 



