Twinkle, twinkle, little star

Record format: Edison talking doll tin cylinder Location: Edison Laboratory, West Orange, New Jersey Recording date: circa November 1888 NPS object catalog number: EDIS 1279 Duration: 12 seconds Credit / Author: National Park Service Date created: 2011-05-11 The record groove surface viewed under a microscope. The nearly uniform groove width shows Edison's early square "chisel-cut" recording technique, used prior to August 1889. National Park Service Specifications of the tin cylinder phonograph record: Estimated original outer diameter (if not misshaped): ~60.4 mm (~2-3/8 inch)



Estimated original inner diameter (if not misshaped): ~53.7 mm (~2-1/8 inch)



Width: ~ 11.4 mm (~7/16 inch)



Thickness: ~ 3.4 mm (~1/8 inch)



Groove threads per inch: 50



Groove type: Vertical cut, nearly uniform groove width.



Recording/playback speed: Unknown. (The playback speed/pitch of the recording as presented here was set by ear.) Return to "Early Talking Doll Recording Discovered" page.

