+-------------------------+-------------+------------------------+ |Hazard | Location |What I Did | +-------------------------+-------------+------------------------+ |_Loose prong on lamp plug|Living Room |Replaced with new plug_ | +-------------------------+-------------+------------------------+ |_Cracked insultor on |Back of house|Notified power _ | |_service wire in house | |supplier_ | +-------------------------+-------------+------------------------+ |_Conduit not securely |Basement by |Notified parents_ | |_clamped to box |fuse box_ | | +-------------------------+-------------+------------------------+ |_Extension cord, old and |Basement, by |Replaced with new_ | |_worn |washing |rubber-covered one and_ | | |_machine |protected it from _ | | | |_water_ | +-------------------------+-------------+------------------------+ LESSON NO. B-10 Credit Points 3 HOW ELECTRIC BELLS WORK--FOR YOU When was the last time you wanted to get a simple message like "You're wanted on the telephone," "There's someone here to see you," or "There's a car in the driveway," to someone around your place? Did you have to walk or run some distance and perhaps shout, too, to be heard by the other person? Perhaps you had to stop some other work, or interrupt your favorite kind of fun, to do this bit of messenger work. If the nature of the message is like one of those mentioned, and the number of people in hearing is not too great, then perhaps you can use bells or buzzers or both to do some of your messenger work for you. Even though a bell or a buzzer can't talk, it can convey a message. What to Do 1. Learn how bells and buzzers work, and learn about the many different kinds. 2. Plan and install a bell system for your home or farm. Bells and Buzzers Can Tell a Lot Electric bells and buzzers use the same basic principle as the telegraph system, invented by Samuel Morse in 1840. Although not as important today as it was before radio, telephone, and teletype became common, the telegraph is still in use. Bells and buzzers, however, are very common and have many uses. They are most often seen in the form of doorbells, and rare is the new home that does not have one or more. Service stations have bell systems to let the operator know that a car is waiting at the gas pumps. A clock signal reminds the homemaker when the cooking time is completed. Children are called to and released from school classes by means of bells and buzzers. Also, various alarms employing bells and buzzers warn us when it's time to get up, or even that the place is on fire, or that a burglar is trying to break in!