A rack-and-pinion railway (opened in 1897) ascends from Llanberis to the summit of the mountain (44 m.).
To the west of Buda extends the hill (1463 ft.) of Svab-Hegy (Schwabenberg), with extensive view and numerous villas; it is ascended by a rack-and-pinion railway.
A web in the focal plane of telescope marks the point in the field at which the bands are to be made to disappear; this is effected by turning the polarizer by means of a rack and pinion worked by an arm from the observer's end of the instrument.
The light is finally received in a Galilean telescope, containing an analyser and carried at the centre of a circular plate, that is graduated on its rim and can be turned in front of a vernier by means of a rack and pinion.
Since, however, only relatively low powers are now employed, the ordinary rack and pinion movement for focusing suffices, and for the illuminating the object only a mirror below the stage is required when the object is transparent, and a condensing lens above the stage when opaque.
