Alvin - Wood Pantograph - 24 Inch - 30 Ratios - The Alvin Wood Pantograph creates enlarged or reduced drawings up to 10x scale. The Alvin Wood Pantograph features arms made from seasoned hardwood and chromed steel hardware and components. Includes table clamp and four spare leads. Not designed for 1:1 ratio. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.