Reflections upon friction : With a plan of the new machine for taking it off in wheel-carriages, windlasses of ships, &c. Together with metal proper for the machine, and full directions for making it. To which is annexed, Stonhenge, one of the wonders of the world, unriddled. By C. Varlo, Esq; author of The new-invested machine, and of the new system of husbandry.