There are two Bars One of these showing the Inspection Bar (I-Bar) having the fixed width the other one is known as Test Bar (T Bar) Mounted on a plate whose width may be increased or decreased through this nob 5 Test Bar available in Instrument.more...
The instrument consists of a rotating cylinder. Over the drum is a metallic screen concealing the drum from outside. The middle of screen has a window opening which allows view of small portion of drum. A list of syllables is pasted on the rotating drum. When drum is rotated, themore...