Brush, Wire Gauze.
A collecting or commutator brush for a dynamo or motor, which brush is
made of wire gauze rolled up and compressed into shape.
Buckling.
The bending up and distortion of secondary battery plates. It is largely
due to over-exhausting the batteries. Where the E. M. F. is never
allowed to fall below 1.90 volt it is far less liable to occur.
Bug.
Any fault or trouble in the connections or working of electric
apparatus.
Bug Trap.
A connection or arrangement for overcoming a "bug." It is said that the
terms "bug" and "bug trap" originated in quadruplex telegraphy.
Bunsen Disc.
In photometry, the Bunsen Disc is a piece of paper upon whose centre a
spot is saturated with melted paraffin, or a ring of paraffined surface
surrounds an untouched central spot. If placed in such a position that
it receives an equal illumination on each side, the spot almost
disappears. It is used on the bar photometer. (See Photometer, Bar.)
Synonym--Grease Spot.