. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. Phono EKG Rl Hfort. listocardiographic recording. Finally, the natural frequency of the entire system should be as low as possible— Hz or less is mandatory. These four requirements imply that the ideal Beg system is one in which subject and bed tloat as a unit in space. Several ingenious systems, some simple, some complex, have been assembled to accomplish the above requirements. Beds have
. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. Phono EKG Rl Hfort. listocardiographic recording. Finally, the natural frequency of the entire system should be as low as possible— Hz or less is mandatory. These four requirements imply that the ideal Beg system is one in which subject and bed tloat as a unit in space. Several ingenious systems, some simple, some complex, have been assembled to accomplish the above requirements. Beds have been con- structed from aluminum and canvas, styrofoam. balsa, or aluminum honey- comb, and suspended by wires or floated on mercury or air. The sim- plest and original bed is based on the pendulum, and was the type used in this stud\. The Beg bed was the same stretcher used to weigh Gigi (Figure 2). The stretcher was constructed from canvas and two 20-fool heavy wall, galvanized steel pipes 3 inches in diameter. The total weight of 227 kg may seem large to most ballisto- cardiographers. but Gigi's weight at the time was 'i00 kg. and the whale: Figure 1. — Examples of normal ballistocardio- graphic tracings in man. From top to bottom are recorded acceleration (A), velocity (V). and displacement (D). In addition, the EKG and the major events of the cardiac cycle are given as reference points. (From Scarborough et Am. J. Cardiol. 2:613-641. 1958.) bed ratio of 20; 1 was more than adequate. Six ropes supported the poles, four at the ends, each 13 feet in length, and two in the middle. A board inserted between the two middle ropes prevented injury to the animal. The six ropes were suspended by a single cable from a crane. During the recording the cable was 7'/2 meters from pulley to hook, giving a natural frequency of about Hz. The crane was part of a truck hoist, which was ideal for isolation from ground because of the pneumatic lift and the rubber tires. Most of
Size: 1108px × 2255px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectgraywhale
