Resonance Apparatus

The Resonance Apparatus consists of an open-ended cylindrical S.S tube, 1M long and 25 mm dia, mounted on a polished wooden board.
The tube is sealed tightly at the lower end with a side tube connected to a brass reservoir using rubber tubing.
The reservoir is mounted on a support, which when raised or lowered, increases or decreases the height of the water column respectively.
The height of the column is determined by measuring the distance between the zero-stop and the lower end of the tube using the meter scale attached to the apparatus.

Component/Feature	Specification
Size/Scale Diameter	6 inches (150 mm) or 7 inches (175 mm/178 mm)
Vernier Reading	1 minute of arc (30 seconds also common)
Main Scale	0-360° with divisions of (0.5 circ ) (150 mm or 175 mm circle)
Vernier Scale	Double ended vernier separated by (180 circ )
Collimator Lens	Achromatic, 178 mm focus, 32 mm clear aperture
Telescope Lens	Achromatic, 178 mm focus, 32 mm clear aperture
Eyepiece	Ramsden Type ((10 times ) or (15 times ) with cross-line graticule
Slit	Unilaterally adjustable, 6mm long
Fine Adjustment	Provided for both telescope and collimator (laterally and vertically)
Prism Table	Marked with lines; leveling screws & interchangeable clamp
Main Structure	Heavy cast metal with bright plated fittings (sometimes stainless steel scale)
Accessories	Prism holder, Grating holder, Watchmaker’s eyeglass, L-key, Hardwood case

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