PY 1113 Glass

Harp Data Sheet

Description of 

vessel

(write #/code on

base)

Description long hollow stem, bowl shaped top

composition glass

stemware long, hollow

height (base to rim, mm) 266mm

Dimensions of 

vessel (mm)

describe the water

containing part of 

the vessel only

diameter @ top rim 99.1 mm

diameter @ middle 94.3 mm

diameter @bottom 30.3 mm

depth (water chamber axis, rim to bottom) 243 mm

for complex shapes trace a profile onto the back of this page, insert image from

camera

Glass thickness

(mm)

@ rim 1.4 mm

@middle >1.4mm

Mass (g) and

Volume (mL)

Mass of vessel empty 247 g

mass of vessel filled with DUIF water 664 g

Volume 417 mL

Finger period

(time (s) for 10

finger cycles

with clean

note)

Empty 1/3 Full 2/3 Full

Trial 1 16.45 18.09 17.96

Trial 2 15.62 16.42 16.14

Trial 3 16.86 17.62 18.09

Average

Probeware

data

Soundshape

with vessel

empty

(filename

,attach labeled

image of 

expanded

shape)

T1 T2 Period (s) Frequency Wavelength (m)

Trial 1 0.001484 0.00298 0.00496 668.449 0.5131

Trial 2 0.00448 0.00598 0.00150 666.666 0.5145

Trial 3 0.007486 0.008998 0.001512 661.376 0.5154

Average 665.497 0.5143

Soundshape

with vessel 1/3

full (filename

attach labeled

image of 

expanded

shape, note

mass vessel +

water

T1 T2 Period Frequency Wavelength (m)

Trial 1 0.007096 0.008589 0.00493 669.792 0.5121

Trial 2 0.013089 0.014695 0.001606 662.665 0.5176

Trial 3 0.028298 0.029794 0.001496 668.449 0.5132

Average 666.968 0.5143

Soundshape

with vessel 2/3

full (filename

T1 T2 Period Frequency Wavelength (m)

Trial 1 0.014223 0.015883 0.00166 602.410 0.5694

Trial 2 0.0237 0.0253 0.00160 625.000 0.5488

 

attach labeled

image of 

expanded

shape)

note mass

vessel + water

Trial 3 0.00649 0.00809 0.00169 591.716 0.5797

Average 606.375 0.5660

Observations

INITIALS OF

RECORDING

STUDENT

DN

Sound shape: clean sinusoidal, complex sinusoidal, non-sinusoidal

Effect of speed of finger rotation the faster you went the sound began to disappear 

Effect of air column depth the less water – more air – the higher the pitch

Effect of vessel diameter the wider the rim the deeper the sound it will produce

Effect of vessel composition crystal had a higher pitch

Effect of clockwise vs counterclockwise rotation made no difference

Effect of fingertip pressure the harder you push the music will stop, same as pushing

less hard

Effect of fingertip wetness dry does not produce sound, and neither does too wet of a

finger 

Differentiation finger squeak and vessel note

any other observations (cob)

Image of Vessel

Sound shape empty

 

Sound shape 1/3 water

Sound shape 2/3 water