Printed with eco-friendly ink and made to last our vinyl stickers come with 4 per sheet and are easy to peel. Great for art printed with high quality and usable inside and outdoors with UV protective laminate. Patent drawing submitted by Sourbieu & Pradel shows two views of an apparatus for steering or controlling the direction of balloons by hand-cranking a series of four rotating sails. (Source: A.G. Renstrom, LC staff, 1981-82). Includes scale. Registration inscription on verso. Tissandier collection.