Search results

...machines''', '''smoke grinders''', or '''bullshit grinders'''). In these toys the drafting instrument is replaced by a [[Crank (mechanism)|crank]] handle [[File:SI ellipsograph crop.jpg|thumb|Wooden ellipsograph (ca. 1900) now at [[Smithsonian Institution Archives|Smithsoni ...

The cylinder blocks are ten wooden cylinders of various dimensions that can be removed from a fitted container ...gned to teach the concepts of "thick" and "thin". It comprises ten sets of wooden prisms with a natural or brown stain finish. Each stair is 20 cm in le ...

...ddle of the shape down its long axis. The strings pass over a small raised wooden bridge positioned in the centre of the shape so that the strings sit above ...Li S-W., Zhang S-J., Fan Y-Y., Ma L. Q. 2015, "Toxic metals in children's toys and jewelry: Coupling bioaccessibility with risk assessment", ''[[Environme ...