🔍 Key Concepts

• Purpose and operation of an aneroid barometer (how it measures pressure and what affects its accuracy) • Effect of temperature and vibration on barometer readings aboard a vessel • Difference between where it can be read easily vs. where it must be mounted on the vessel

💭 Think About

• Think about what environmental conditions (like temperature changes, vibration, and movement) might interfere with accurate pressure readings on a ship. • Consider whether this instrument needs to be fixed in one place for consistent readings, or if its location is mainly about crew convenience. • Ask yourself which option describes something that is actually important to how a barometer functions, rather than just sounding "protective" or comfortable for passengers.

✅ Before You Answer

• Check which choice focuses on accuracy and consistency of readings, not comfort or safety structures. • Eliminate any options that mainly describe passenger comfort or collision protection, which are not primary concerns for a pressure instrument. • Verify which option reflects standard practice for navigational and meteorological instruments on working vessels.