CHAPTER ONE INTRODUCTION 1.1 BACKGROUND OF THE STUDY A siren is a loud noise making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulance, police cars and fire trucks. There are two general types of siren: 1-Pneumatic Siren 2-Electronic Siren Many fire sirens (used for calling the volunteer fire fighters) serve double ...
Read moreCHAPTER ONE INTRODUCTION 1.1 OVERVIEW A siren is a loud noise making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulance, police cars and fire trucks. There are two general types of siren: 1-Pneumatic Siren 2-Electronic Siren Many fire sirens (used for calling the volunteer fire fighters) serve double duty ...
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