3b-scientific Demonstration Monochord Manuel d'utilisateur télécharger pdf

Instruction sheet

3B SCIENTIFIC® PHYSICS

U15100 Monochord

4/03 ALF

The Monochord demonstrates how the pitch of the

sound produced by vibrating strings is dependent on

their tension, length and thickness.

1. Description, technical data

The monochord consists of a wooden sound box over

which two steel strings and a nylon string are stretched.

The tension of two of the strings can be adjusted by

means of tuning pegs at one end while the third is

adjusted by running it over a pulley and attaching weights

or a dynamometer. The effective length of the strings

can be adjusted using two moveable bridges. The lengths

can be read from a scale on the side of the box.

Dimensions of sound box: 700 mm x 90 mm x 70 mm

Scale length: 600 mm

Scale divisions: cm and dm

2. Instructions for use

• Excite the strings by plucking them or bowing them.

• The desired length of the strings can be set by mov-

ing the bridges and can be read from the scale.

Name of Frequency Interval Ratio of string

note ratioroot : overtone lengthsroot : overtone

c : c 1:1 root 1:1

c : d 8:9 second 9:8

c : e 4:5 major third 5:4

c : f 3:4 fourth 4:3

c : g 2:3 fifth 3:2

c : a 3:5 major sixth 5:3

c : h 8:15 major seventh 15:8

c : c` 1:2 octave 2:1

c : g` 1:3 3:1

c : c`` 1:4 4:1

c : e`` 1:5 5:1

c : g`` 1:6 6:1

A major scale can be generated by adjusted the length of the strings to the following ratios:

1 Tuning peg

2 Pulley

3 Adjustable bridge

4 Sound box

5 Scale

1 2

Résumé du contenu

Page 1 - U15100 Monochord

3Instruction sheet3B SCIENTIFIC® PHYSICSU15100 Monochord4/03 ALF®The Monochord demonstrates how the pitch of thesound produced by vibrating strings i

Page 2

4To determine the frequency ratios:• Tune two strings to the same note.• Move the bridge under one of the two strings to aposition given by the ratios

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