In the apparatus of type B as made by Zeiss there are two microscopes attached to a base-plate, one of which views the spectrum-plate (or other object) to be measured, while the other views a scale that moves with the slide on which the spectrumplate is mounted.
type b הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד