Contains 1 Result:
Sonogram rolls, n.d. [1940s?-1970s?]
Two sonogram rolls of the same graph showing kilocycles against seconds. On the charts are black shapes, assumed to represent different breeds of birds.
Collection: Papers of Edward Allworthy Armstrong
Shelfmark: MS. 14899/24
Extents: 1 box
Dates: n.d. [1940s?-1970s?]