Setting of angles on machine tools speeded by magnetic protractor

An adjustable protractor facilitates transference of angles to remote machine tools. It has a magnetic base incorporating a beam which can be adjusted until its shadow coincides with an image on the screen of a projector

Control of lice on poultry

DURING February and March of 1965 some particularly heavy body lice infestations were found on fowls in both deep litter and cage units in Western Australia. In some instances comparatively new laying cage units were involved. The most seriously affected flocks showed marked unthriftiness and depressed egg production

The effect of seaweed meal on yolk colour

Could seaweed, plentiful on local beaches, be used to improve egg yolk colour? This article gives the results of experiments at the Department\u27s Poultry Research Station

The analysis and modeling of the feedback process of the labor market: a dynamic model on Portugal’s national economy

The present paper proposes a system dynamics approach to the feedback process of the labor market taking place at macroeconomic level. The model was constructed on Keynesian theory introducing into the model adjustment by quantity and the wage was modeled as an endogenous state variable. The objective of studying the functioning of the presented feedback process is that of understanding its role and effect in the real economy cybernetic system in order to make it a functional part of the system of models that capture the national economy as a whole to be used in macroeconomic governance. The analysis and simulations of the model were done on Portugal’s national accounts between 2005 and 2011 and the model is able to produce the behavior in time of the state variables wage and unemployed persons close to historical data.info:eu-repo/semantics/publishedVersio

Vegetation and the importance of insecticide-treated target siting for control of Glossina fuscipes fuscipes

Control of tsetse flies using insecticide-treated targets is often hampered by vegetation re-growth and encroachment which obscures a target and renders it less effective. Potentially this is of particular concern for the newly developed small targets (0.25 high × 0.5 m wide) which show promise for cost-efficient control of Palpalis group tsetse flies. Consequently the performance of a small target was investigated for Glossina fuscipes fuscipes in Kenya, when the target was obscured following the placement of vegetation to simulate various degrees of natural bush encroachment. Catches decreased significantly only when the target was obscured by more than 80%. Even if a small target is underneath a very low overhanging bush (0.5 m above ground), the numbers of G. f. fuscipes decreased by only about 30% compared to a target in the open. We show that the efficiency of the small targets, even in small (1 m diameter) clearings, is largely uncompromised by vegetation re-growth because G. f. fuscipes readily enter between and under vegetation. The essential characteristic is that there should be some openings between vegetation. This implies that for this important vector of HAT, and possibly other Palpalis group flies, a smaller initial clearance zone around targets can be made and longer interval between site maintenance visits is possible both of which will result in cost savings for large scale operations. We also investigated and discuss other site features e.g. large solid objects and position in relation to the water's edge in terms of the efficacy of the small targets