. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. Figure 1. The tethering apparatus and the force transducers. The dashed lines indicate the water level during the experiments. (Al Trans- ducer 1. The inset at top right is a plan view of the schematic with the squid and tether apparatus removed. The bracket above the squid indicates the dorsal mantle length (DML), and the white arrow points to 1/3 DML. AB, aluminum base; BBE. brass blade element; BN, brass nut; N. needle; P, stainless steel post; SG, thin foil strain gauge; W. plastic washer. (B) Transducer 2. The inset
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. Figure 1. The tethering apparatus and the force transducers. The dashed lines indicate the water level during the experiments. (Al Trans- ducer 1. The inset at top right is a plan view of the schematic with the squid and tether apparatus removed. The bracket above the squid indicates the dorsal mantle length (DML), and the white arrow points to 1/3 DML. AB, aluminum base; BBE. brass blade element; BN, brass nut; N. needle; P, stainless steel post; SG, thin foil strain gauge; W. plastic washer. (B) Transducer 2. The inset at left is a front view of the transducer with the squid removed. Abbreviations same as in A except as follows: ABE, aluminum blade element; BB, box beam; S. screws; SSG, semiconductor strain gauge. ducers: one which had the post located downstream of the funnel and one which did not (see Fig. 1). The force transducers We built two force transducers to measure the thrust produced by the squid. The first force transducer (transducer 1) consisted of thin foil strain gauges, wired as a full bridge (see Biewener and Full, 1992), and glued to two brass blade elements (Fig. 1 A; see Appendix for details). We used long, thin blade elements to obtain the sensitivity necessary to measure the small thrust forces of the hutchlings. Thus, the resonant frequency of the force transducer was fairly low (about 55 Hz when unloaded in air). We also built a second force transducer (transducer 2) with a higher resonant frequency (about 110 Hz when unloaded in air). It consisted of a single aluminum blade element with semiconductor strain gauges wired as a half bridge (Fig. IB, see Appendix). The higher gauge factor of the semiconductor strain gauges allowed the stiffness of the blade element to be increased without sacrificing sensitivity. Using analysis of covariance (Glantz and Slinker, 2001), we compared the data from the two force transducers. The adjusted slopes and means of the two data sets
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
