(c) The Board of Investigation was free under the terms of its appointment to settle its own procedure. It did in fact regard itself as performing a quasi- judicial function in its investigation of the application for a flat rate increase of wages. Thereafter in applying itself to the consideration of the details of a bonus on output, it regarded itself as a non-judicial Board whose primary object was to devise a scheme for assisting the Government in securing an increase in the output of coal. 3.