Read e-book online Compendium of Seashells PDF

By R. Tucker Abbott, S. Peter Dance

ISBN-10: 0966172000

ISBN-13: 9780966172003

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10b (with log. y‐axis) shows the increase in effective range of the larger anode sizes. The values shown are for 10 mm thickness rings energised at 200 V with a 750 mm braid cathode positioned 10 m away in the direction of measurement: the electrode is positioned at 0 cm. 2). Cuinat (1967) considered that the voltage propagation characteristics of a ring‐shaped anode could be described by the propagation characteristics of hemispheres. From this relationship, he was able to calculate the voltage required to produce a particular voltage gradient at any distance from any sized anode.

G. Hartley, personal communication). By rotating the probe, the maximum and minimum values for the voltage gradient can be found for any position, and thus the field pattern can be plotted for any electrode or voltage combination. Care should be taken if using such a probe that no contact is made directly to the electrodes, and adequate insulation is used in the construction materials due to the high voltages that may be encountered. As the probe moves between electrodes 1 and 2, the distance between contacts ‘a’ and ‘b’ is kept constant.

G. cm−1) with the gear configuration described above, circuit equivalent resistance will be 20 Ω, so, 300 ÷ 20 = 15 A: in other words, approximately 10 times higher. 75 A (25% of 15). cm2. 3) where J = current density; E = voltage gradient; and c = water conductivity. g. Smolian 1944, Monan & Engstrom 1962, Kolz 1989, Kolz & Reynolds 1990, Sternin et al. 1976) consider that current density is the 42 Chapter 4 most significant factor in determining a fish’s reaction to an electrical field. 3 on PTT for a description of power density and output standardisation).

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Compendium of Seashells by R. Tucker Abbott, S. Peter Dance


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