Bush Type Research Articles

The Ecology ofGlossina morsitans, Westw., and two possible Methods for its Destruction.—Part II

A small belt ofGlossina morsitanshas been studied for four and a half consecutive years.The community has been observed during the period of its prosperity when the population increased and attempted to colonise unsuitable country ; the outward spread of the fly was checked by insuperable natural barriers, and a period intervened when the fly advance had come to a standstill ; the tsetse were observed in their attempt to breed and establish themselves in an area that could only temporarily suffice their needs.This optimum period was brought to a sudden close by the advent of unfavourable climatic conditions. The effort made by the community to establish a habitat in an unsuitable type of bush was frustrated by the almost complete extermination of its population. The country which had been colonised by the tsetse was depopulated, and once more was limited to a small population that had survived in the true and permanent habitats. A long period followed in which the tsetse were seen to make a slow but steady recovery. The investigation closes with recovery assured, but the community still too depleted in numbers to attempt further expansion for a considerable time.Throughout this rise and fall in the fortunes of the fly community, the size of the tsetse population has been seen to fluctuate seasonally with the annual variations in the climate.

Bushing-Type Current Transformers for Metering

This paper describes a new development in connection with bushing type current-transformer metering circuits. While this development utilizes the two-stage principle and has the same order of accuracy as that of two-stage current transformers, it is different from the conventional two-stage current transformers in that it does not require two-stage wattmeters and watthour meters, but may be used with any wattmeter or watthour meter. The principle and connections of the transformer are explained, and performance curves of a typical unit are given.

Bushing-type current transformers for metering

This paper describes a new development in connection with bushing type current-transformer metering circuits, While this development utilizes the two-stage principle and has the same order of accuracy as that of two-stage current transformers, it is different from the conventional two-stage current transformers in that it does not require two-stage wattmeters and watthour meters, but may be used with any wattmeter or watthour meter. The principle and connections of the transformer are explained, and performance curves of a typical unit are given.

Notes on Tsetse – Flies and on Prophylactic Measures Against Sleeping Sickness in the Western Province of Ashanti

Glossina fusca and G. palpalis are prevalent throughout the Western Province of Ashanti, the latter being much the most common species. They both occur in dense jungle, but the type of bush most favourable for them appears to be the scrub and smaller forest which occurs in the dividing line of country between the dense jungle and typical “orchard” grass bush. Scrub of a height of three or four feet upwards appears to be sufficient to harbour these insects.