Quick Answer: The Sonometer (3-Wire Pattern) is a wooden box sonometer with mm scales and fixed bridges 720 mm apart, used to investigate how the pitch of a vibrating string depends on its length, tension and thickness.
Last updated: October 2026
Key Features
Wooden box with scales divided in mm between fixed bridges
720 mm between the fixed bridges
One wire can be fitted with a Newton Meter reading 100 N to exert and measure tension
Two strings of different diameter tensioned with tuning machines
A bridge inserted under the string varies its length
Strings sounded by bowing or plucking
Technical Specifications
Specification
Value
Distance between fixed bridges
720mm
Dimensions
(L)1290mm x (W)130mm x (H)110mm
Body
Wooden box
Scales
Divided in mm
About This Product
The sonometer covers frequency against length, tension and mass per unit length, and the vibration frequency of a stretched string as a function of its length, tension and density. Inserting a bridge under the string at certain lengths lets students verify how pitch depends on length. A replacement set of strings is available separately.
Frequently Asked Questions
Q1. How is the tension measured? A Newton Meter reading 100 N can be fitted to one wire to exert and measure the tension. Masses or a dynamometer can be attached to the other string.
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