This article presents the results of investigating the influence of tooth contact ratio in helical cylindrical gears on vibroactivity of the gearbox. Based on the measurements carried out on a laboratory test stand, time-domain and frequency-domain start-up characteristics of vibrations and acoustic pressure were determined, and vibroactivity was assessed for a gearbox in which 4 pairs of gears were successively mounted with different face contact ratios equal to, respectively, epsilon beta=1,001; 1,318; 1,574; 2,636.

The aim of this paper was to study the morphogenesis and analyse the preservation of historical compositional values in the context of the process of layout transformation taking into account the radial forms of former Frederician villages in contemporary Poland. A multiple-case study was applied to five former Prussian colonies that correspond to locational and morphological criteria: Jedlice, Kup, Pokój, Nowosolna and Paproć Duża. The study employed morphological plan analysis in conjunction with the retrogressive genetic method. Research in dynamic form was based on a sequence of chronologically collated plans and historical maps. The reconstruction of the initial stage and the study of the directions of transformation and sustainability of the former spatial composition in comparative terms were the results of the research. The analysed forms are unique, i.e., very valuable in terms of their layout features. Paproć Duża is a fully preserved layout with high values in terms of the durability of its historical composition. Kup, Pokój and Nowosolna, due to a considerable morphological transformations, comprise a group of partially preserved spatial layouts, with average values, while Jedlice is an example of a poorly preserved historical layout with low compositional values.