  We report experimental observations of traveling waves in a pure fluid with a
free surface situated in a long container submitted to a horizontal temperature
gradient perpendicular to its large extension. Above a critical value of the
gradient and depending on the height of liquid $ h, $ a source of waves is
created in the container for small value of $ h, $ while the system exhibits
stationary patterns for larger values of $ h. $ The spatio-temporal properties
of the waves are studied and compared to theoretical predictions. Email
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