User:Eric.dane~enwiki
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Category:Historical scientific instruments
for my students[edit]
instruments[edit]
Spectrograph : The bandpass filters method usually uses analog processing to divide the input signal into frequency bands; the magnitude of each filter's output controls a transducer that records the spectrogram as an image on paper.[1]
project-management software[edit]
research[edit]
Humans[edit]
- Charles_Sanders_Peirce
- John Dewey
- Lev Vygotsky
- Jean Piaget
- Quotations related to Kenneth Boulding at Wikiquote