@misc{65758, note = {{http://vlp.mpiwg-berlin.mpg.de/references?id=lit81 40\&page=p0008\&mk=0.058/0.5244 http://vlp.mpiwg-ber lin.mpg.de/references?id=lit8140\&page=p0016s0007\&m k=0.4726/0.8949 This device seems to be M51, see (Cambr. Scient. Instr. Comp. Catalogue1899, item No. 392): http://www.sil.si.edu/digitalcollections/trade- literature/scientific- instruments/files/51682/imagepages/image117.htm Rand: Please confirm. Comment Rand Evans II: Yes, this is Galton’s Apparatus for testing the apprciation of difference in musical Pitch. M51. The illustration below is from Cambridge Scientific Instruments Catalogue of 1899 [Related img30381, similar to link above ] Thumbnail replaced with marked version. Page field changed to assumed MünsterbergID}}, url = {https://vlp-new.ur.de/images/img30186} }