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Office MemOrandum • UNITED STATES GOVERNMENT

TO : Chief, Security Research Staff

DATE: 19 August 1953

Sidetone Delay Equipment.

l. Üpon receint of the above-named equioment, it uas set up in the Technical Erench laboratory. Here it was tested in evory way conceivable to make this equipmènt useful or adaotable to our needs.

2. The report by was studied and conclusions made me agree that this equipment would not be useful unless concealed as part of some other testing apparatus and even then its value was questioned.

3. The equipment is.basically a Magnecord Frofessional Recorder to thich a tane storage and drive mechanism has been added. Also added is a variable tape monitor lag which permits varying the time of lag. This device was determined not too essential (also in, report) since the Magnecord Recorder has a .2 second delay built in.

4. The equipnent was then dismantled and set uo in Roon 12 for of.for further study by his group. He advised that some time would be required to complete his testing and findings.

5. Finally, it is my opinion that report is complete and conclusive that the STD equipment adds nothing to known interrogation equipment or techniques.

STANDARD FOM NO. 54