Counts of territorial basking American alligators (Alligator mississippiensis) employing the Petersen Index principle of mark and recapture were tested on four national wildlife refuges from 1969 to ...1971. Individual alligators were marked on their basking sites by animal length, site description, vehicle odometer reading, and flagging tape without the necessity of physically trapping, marking, or recapturing specimens. Some alligators were painted to ascertain stability of basking territories, to serve as a known population, and as another way to estimate the sample population. Counts were conducted during the first 7 to 10 days of the first sustained spring warm front. The high recovery rate of marked alligators will achieve precision within 20 percent of the mean estimate (95 percent confidence) when 30 or more alligators are counted in the sample area. Accurate estimates can also be made of size (age) classes. Failure of an observer to see alligators, a small population in a sample unit, and recognition of the proper warm front are the main problems that may be encountered in using this counting technique.
Flashover tests were conducted at the Leadville EHV Test Facility of the Public Service Company of Colorado and Project EHV at Pittsfield, Mass., to obtain comparative data to evaluate the influence ...of air density on switching surge and impulse flashover strength of transmission line insulation. The tests showed that negative polarity flashover voltages are greater than those of positive polarity. Therefore, positive polarity will be the critical requirement for transmission line design for switching surge duty.
The Otter Tail Power Company plans to convert a 90-mile section of 115-kV wood-pole transmission line to 230 kV. This paper describes the electrical and structural analysis upon which final selection ...of the uprated design was based.
