The History of Magnetic Contacts
Did You Know?
When World War I ended, an increase in crime followed. As a result, Americans became sensitive to security needs and were eager to find ways to protect themselves and their property. Additionally, many insurance companies began offering premium discounts to alarm subscribers. These events produced a consumer demand for alarm systems.
The first home security systems
During this time, homeowners may have subscribed to a service called door shakers— a group of night watchmen who would shake subscribers’ doors each night to ensure they were locked. More advanced users may have installed an alarm system that used electromagnetic contacts fastened to doors and windows, which were connected to a battery and bell. These systems were monitored by a central station that sent a guard to the residence when the alarm was triggered.