Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 ^^g^^%%%%%%%%%%%%%%%%>g^:^-rp 56. Using the Pulley to Raise Heavy Stone Out of the Ground.— The pulley may frequently be used to ad- vantage in raising heavy stone out of the ground, and in pull- ing stumps, as shown in Fig. 18. If a pulley is fixed to the chain in either of the above cases, and the team draws upon a rope passing through it to a fixed attachment, as shown, two horses will exert the traction of four upon the stump or stone, diminished by the friction of th
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 ^^g^^%%%%%%%%%%%%%%%%>g^:^-rp 56. Using the Pulley to Raise Heavy Stone Out of the Ground.— The pulley may frequently be used to ad- vantage in raising heavy stone out of the ground, and in pull- ing stumps, as shown in Fig. 18. If a pulley is fixed to the chain in either of the above cases, and the team draws upon a rope passing through it to a fixed attachment, as shown, two horses will exert the traction of four upon the stump or stone, diminished by the friction of the pulley. If the chain is attached to the stone, and so passed over the top as to roll, instead of drag, it from its place, the mechanical advantage will be still greater. 57. The Screw.— This mechanical power is practically a combination of the inclined plane and the lever. The threads of the screw, and of the nut also, represent inclined planes
Size: 2864px × 698px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
