APPENDIX
ZEISS List of abbreviations Axio Observer
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M, mot. motorized
Man manual
N. A. Numerical aperture
Ph, PH Phase contrast
PL Plan
PlasDIC Plastic differential interference contrast
RL Reflected light
SLR Single lens reflex
SW Wrench size across flats
T Slow-blow (fuse type)
TIC Total Interference Contrast in circularly polarized light
TFT Thin film transistor
TL Transmitted light
TV Television
UL Underwriter Laboratories (a US testing agency)
USB Universal serial bus
VIS, vis visual