CERC has used wave gages to gather prototype wave data since 1948. Two basic types of gages are now used in the fieldthe step-resistance staff gage and the underwater pressure-sensitive gage. CERC has developed three types of step-resistance staff gagesa series type for use in fresh water, a parallel type for use in salt water, and a relay-operated type for use in either fresh or salt water or in water where wide changes in salinity occur. The pressure gage can be used in water of any salinity. The series and parallel gages have an accuracy of ±5 percent plus the spacing of one sensor increment. The relay gage has an accuracy of ±2 percent plus the spacing of one sensor increment. The accuracy of the pressure-sensitive gage is not as precise as that of the step-resistance gages The report describes each gage and the theory of operation, details of fabrication, steps for calibration and installation, and requirements of maintenance. FOREWORD This report describes in detail the sensors and recorders used by CERC in wave-data collection programs. Leo C. Williams, Chief of the Instrumentation and Equipment Branch, Research Division, prepared this report and developed most of the wave-data equipment used at CERC.
In the title compound, C16H12N2S2, the thiophene groups are rotationally disordered over two sets of sites, by approximately 180°, with occupancy ratios of 0.916 (2):0.084 (2) and 0.903 (2):0.097 (2). The major components of the thiophene and methylene substituted thiophene rings are canted by 24.06 (12) and 85.07 (10)°, respectively, from the benzimidazole ring system plane and the dihedral angle between the major component thiophene ring planes is 84.90 (14)°. In the crystal, there is a weak C—H⋯N hydrogen bond which links molecules into chains.
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