3-7. VISION DEVICES.
Vision devices are generally rugged but mishandling will result in damaged equipment.
Do not turn screws or other parts that are not needed for operation.
Do not move any knob or part beyond its limit. Forcing parts will result in damaged equipment.
Keep devices dry. Wipe completely before stowing periscopes.
Properly stow or cover M24, M24A1, and AN/WS-2(V)1A periscopes when not in use.
If a device fails to work, gets water in it, or has damaged lenses, turn it over to unit maintenance.
Touch up (Appx. D, item 17, 18, 19, or 20) scratch or chipped areas that expose bare metal. Never paint
Keep lenses clean and dry. Proper care will ensure good vision. Keep M24, M24A1, and AN/WVVS-
2(V)1A periscopes protected from direct sunlight.
It is prohibited to clean lenses and windows with pastes or abrasives.
Only use lens tissue (Appx. D, item 38) to wipe lenses and windows. Cloths are not permitted. Use camel-
hair brush (Appx. D, item 6) to remove dirt or dust.
Keep lenses free from oil or grease. Do not touch lenses or windows with your fingers. Use alcohol (Appx.
D, item 21) on lens tissue to remove grease or oil. If alcohol is not available use lens tissue. Do not rub too
hard. Lenses have special coatings on them.
Condensation might result if lenses are cooler than surrounding air. Place instrument in warm place to dry.
Keep away from high heat.
Lubrication. The M17, M24, M24A1, and AN/WS-2(V)1A periscopes do not require lubrication.