An internal combustion engine in a working device comprises an oil reservoir near a crankcase to hold oil. Typically, the method is applied to the dyeing of textile fibres at liquor ratios of \u22661:1 and is carried out in the absence of additives conventionally included for the sole purpose of promoting dye uptake by controlling electrical interactions or otherwise enhancing interactions between the substrate and the treatment agent. In alternative embodiments, a display book system is modified to provide a viewing compartment formed in association with the framed picture portion to allow display of discrete objects including three dimensional objects such as figurines as well as images and pictures, opaque or translucent, which are substantially two dimensional.