This Mutual Inductance Bridge is comprised of three coils, one primary (2.54 cm diameter, length 7.6 cm, and about 5,000 turns) and two secondary (length 2.5 cm, separation 2.0 cm, and about 2,500 turns). The secondary coils are wrapped around the primary and counter-wound to each other. The gauge of the copper wire used is 42.5 and 44.5, which correspond to wire diameters of 60 m, and 50 m for primary and secondary coils, respectively (100 m is the average human hair size). The winding of these coils is accomplished with a modified lathe that is driven by two stepper-motors. These motors are controlled with two electronic boards. One board and its stepper-motor rotate the axle on which the coils are being wound; the second board advances the guide platform by a wire's width for each revolution of the coil.
|Presenter:||Chris Knupp (Undergraduate Student)|
|Location:||Seymour Union Main Lounge|
|Time:||1:15 pm Session III|
Poetry Out Loud Recitation Competition
6 pm - 8 pm
American Democracy Project Lecture: Janet Poppendieck
5 pm - 5:45 pm