D O C . 6 6 O P I N I O N O N S I G N A L V S . A T L A S 4 7 9
Deutsches Reichspatent 257211 and Deutsches Reichspatent 257212, both entitled “Einrichtung
zur Bestimmung der Richtung von Schallwellen. Zusatz zum Patent 256747,” were granted on
1 March 1913 to Aurel Meckel. They added two devices to the original arrangement (see note 2) for
indicating and recording the direction and distance of a sound source.
“ologische” is inserted in Ilse Einstein’s hand.
This is the precision the patentee indicated in its letter of 11 March 1912 to the Department of
Appellations of the Patent Office (see Chapter B, paragraph 2).
“nach” is inserted in Ilse Einstein’s hand.
This description agrees with the patent description of Deutsches Reichspatent 301669 summa-
rized in note 2.
At this point in the original text the insertion of the following passage is indicated in Ilse Ein-
stein’s hand: “mit der wirksamen Zeitdifferenz verknüpften.”
See note 6.
Co-plaintiff is someone who is entitled to lay claim to damages in a public suit filed by the
(principal) plaintiff (Seligsohn 1920, p. 431).