Barus, Carl
Displacement interferometry by the aid of the
achromatic fringes.
P. 3-4.	4:o Washington 1919.
=Publication. Carnegie institution of Wa-
shington. Publication No. 249. P. 3-4.
P. /1/-2. se: Barus, Carl, The interferometry
of reversed and non-?eversed spectra. P. /1/-2.

Barus, Carl	7
Displacement interferometry by the aid of the
achromatic fringes.
P. 3-4.	4:0 Washington 1919.
-Publication. Carnegie institution of Wa-
shington. Publication No. 249. P. 3-4.
P. /1/-2. sej Barus, Carl, The interferometry
of reversed and non-reversed spectra. P. /1/-2.
7