text: …arteries (internal diameter = 240.94+5.42 mm, n=67/25) were mounted as ring preparations in a Mulvany-Halpern double myograph (J, P Trading, Aarhus, Denmark), mounted on two 40 mm steel wires which are attached to a force transducer and a micrometer, as described by Mulvany & Halpern (1977).