frequency response test records
Date: ca. 1920-1925
Inventory Number: RS0912
Classification: Notebook
Subject:
Maker: Cruft Laboratory, Harvard University (founded 1914)
Cultural Region:
Place of Origin:
Dimensions:
1 x 55 x 22 cm (3/8 x 21 5/8 x 8 11/16 in.)
Description:
Black rectangular metal notebook. Its pages are printed with empty XY charts, with "FREQUENCY IN CYCLES PER SECOND" (30-20,000) in the X-axis, and "RELATIVE RESPONSE IN DECIBELS" (0-40) in the Y axis. The pages have lines inscribed by hand with ink
Signedon top of each page: (TOBE logo) Audi-o-Graph Model 15-D / Apparatus Tested ........ Date ....... / Remarks......
on bottom of each page: Cruft Laboratory - Harvard University
on bottom of each page: Cruft Laboratory - Harvard University
FunctionVery likely to register the performance of amplifiers, speakers, and other electronic equipment, for the entire spectrum of human hearing.
Curatorial RemarksThe Collection has several frequency response charts that were made at the Cruft Laboratory to test different types of speakers in the early 1920s. This notebook may contain the original data, or be related to that work. See, DPWN0006b, DPWN0038b, DPWN0040b, DPWN0044b, DPWN0052b.
ProvenanceCruft Laboratory, Harvard University.