This paper presents a multivariate regression predictive model of drift on the Coordinate Measuring Machine (CMM) behaviour. Evaluation tests on a CMM with a multi-step gauge were carried out following an extended version of an ISO evaluation procedure with a periodicity of at least once a week and during more than five months. This test procedure consists in measuring the gauge for several range volumes, spatial locations, distances and repetitions. The procedure, environment conditions and even the gauge have been kept invariables, so a massive measurement dataset was collected over time under high repeatability conditions. A multivariate regression analysis has revealed the main parameters that could affect the CMM behaviour, and then detected a trend on the CMM performance drift. A performance model that considers both the size of the measured dimension and the elapsed time since the last CMM calibration has been developed. This model can predict the CMM performance and measurement reliability over time and also can estimate an optimized period between calibrations for a specific measurement length or accuracy level.

Polish musical criticism of 19th century is a fascinating research field for musicologists, music theorists, as well as literary scholars. They can find there a wealth of texts whose expressive style tries to emulate the homage paid to the great virtuosos of the time in poetry. While Frederick Chopin and the violinist Karol Lipiński held sway over captive audiences, there was yet another musician whose name featured prominently in reviews and poems. It was Stanisław Szczepanowski, the great guitarist, whose concerts gave rise to numerous reviews representing the romantic school of musical criticism. This paper examines some of those reviews as well as two poems dedicated to Szczepanowski, one by Teofil Lenartowicz and the other by Władysław Syrokomla.