Harmonic analyser

Made:
Germany
Harmonic analyser (harmonic analyser; planimeter)

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Harmonic analyser, Mader's form, in fitted case, with planimeter, discs for 1-9 harmonic oscillations and drawing board

In 1909, the German engineer Otto Mader designed this form of harmonic analyser which was built by manufacturers Gebrüder Stärzl in Munich. As all harmonic analysers, it can analyse a curve harmonically which means that it can calculate mathematically a given curve’s periodicity. It was an easier to use and time saving analyser compared to previous examples. Its main advantages were that it could be used with any polar planimeter, and it could be applied to periodic curves of any base (a curve's base describes how 'curved' it is) unlike previous analysers that could only be applied to fixed base curves and so curves required re-drawing before being analysed. This analyser has 9 wheels and so it can calculate up to 9 frequencies. The more gears an instrument had the more detailed its analysis could be but such a feature would also make it more expensive.

Details

Category:
Mathematics
Object Number:
1911-213
type:
harmonic analyser and planimeter
credit:
Starze, G.

Parts

Drawing board used with harmonic analyser

Drawing board used with harmonic analyser

Drawing board used in conjunction with harmonic analyser, Mader's form, in fitted case, with planimeter and discs for 1-9 harmonic oscillations

Materials:
wood
Object Number:
1911-213 Pt1
type:
drawing board
Case for Mader's form harmonic analyser

Case for Mader's form harmonic analyser

Case for harmonic analyser, Mader's form, with planimeter and discs for 1-9 harmonic oscillations

Object Number:
1911-213 Pt2
type:
instrument case
Harmonic analyser

Harmonic analyser

Harmonic analyser, Mader's form, with planimeter and discs for 1-9 harmonic oscillations

Object Number:
1911-213 Pt3
type:
harmonic analyser and planimeter