Houses), and when suitably dry, a ridge, 4 x 0 3 cm., is made on the block by means of a U-shaped piece of thin metal (Fig. 1). This 'ridger' was made from a piece of waste brass but any other thin metal should serve equally well. The open end of the 'ridger' is pressed firmly onto the block and pushed down evenly through the entire thickness (0 5 cm.) of… (More)
Figures and Tables
Sorry, we couldn't extract any figures or tables for this paper.