The Sheet-Metal Worker's Instructor

alloys base bending bisect blank borax bottom brazing Britannia metal centre line circle circumference complete the pattern cone construct an angle convenient number copper cut face cut the line cut the perpendicular cylinder describe the pattern diagonal diameter disc divide draw a line draw lines draw perpendiculars draw the line edge elevation ellipse envelope figure frustum given gonal hammer inches Join joint line CD machines mark metal number of equal obtained parallel perpendicular line pipe plane planishing plate points of intersection PROBLEM punch pyramid radii radius describe rhombus right angles seams semicircle set squares sheet shown in Fig shows sides slant height solder speculum metal spelter square straight line strike the curve strike the pattern take the distance Take the length take the radius tapering thick thin triangle vertical height width zinc