372 "List Active Matters," memorandum TAE, March 17, 1921, D-Box Collection Box 23, "Edison
Files.
375 See photographs 12. 4,” 5.373 The experiments long playing records
would have used the pressing equipment and recording facilities set in
Building 4. J.
An important innovation that was hurriedly introduced bolster the Edison
phonograph business was the long playing record. This was developed Building
4 and finally introduced 1926.375
112
. nos. The development and testing work was carried out this building while
the design and production engineering was done elsewhere.
worked room the rear the building one group offices
established the 1920s.440/102 through 12. Thomas Edison Jr.machinery press disc records.
Coakley who acted domestic science consultant the Edicraft project.440/106, neg. Several other experimenters worked here, did Mrs. 8098 through 8102, Photograph Album
43, catalog 751 (not reproduced for this report).
The development the Edicraft line kitchen appliances was effort regain
some the consumer market that the Edison phonograph had lost the late
1920s.374
Photographs these experimental rooms dated 1939 show rooms for battery and
other electrical testing, offices with drafting tables, vacuum pump rooms, and a
small machine shop."
373 NPS, "HSR, Metallurgical Laboratory, Building No.372 likely that the two latter activities took
place Building 4.
374 Ibid
