W L Batt M E (2 results)

Soft cover. Condition: Very Good. Stapled softcover trade catalogue with off-white stiff paper wraps. Circa early 20th century. 9 x 7.5 inches. 10 pages. Paper wraps only extend halfway across catalogue and all pages have a crease in the middle. The binding is very secure and, other than some smudging around the crease (mostly due to the type bleeding through very slightly in this area), the pages are clean. Diagrams accompany the statements on the correct usage and placement of ball bearings in airplanes. Includes such facts as: there are two ball bearings for airplanes (radial or annular bearing and the thrust bearing), mounting of ball bearings (permanently tight fit on shaft), lubrication (use as heavy a lubricant as possible), and more.

Soft cover. Condition: Good. Softcover trade pamphlet that consists of an article entitled "The Application of Ball Bearings to the Airplane" by W. L. Batt, M. E. Cream wrappers, in good condition. 10 pages, measuring 4 x 9 inches in size. Contains black & white figures. The wrappers have rubbing on both sides, and wear along edges. Corners are bumped. There is a tear along the hinge, measuring 1.5" from the top. The back cover also has a long tear measuring 2". Binding is strong, with no loose or missing pages. This is an ex-library copy. The front cover and first page both have a small "Engineering Reading Room" stamp. The front cover also has a catalog sticker in the corner, another library stamp, and a note in pen that reads "Not to be taken. Reading Room".