Record

Document Reference	PPM/15/41/1-13
Title	35 mm slides from a single hanging slide storage sheet labelled 'Acoustic Control (1996)'; 1996
Date	1996
Extent	13 slides
Level	SubSeries
Access Conditions	Access is restricted under current Data Protection legislation. Also, access to the original slides is restricted for preservation reasons; readers are expected to use surrogate digital images. Please see our Access Policy or contact us for further advice.
Content Description	Slides include magnetic field diagrams; drawings of coils and magnets, including some showing acoustic screens; circuit diagrams; and graphs of phase vs frequency and acoustic output vs frequency for various materials.