TAILIEUCHUNG - Five Hundred and Seven Mechanical Movements - North, Dug_8

Tham khảo tài liệu 'five hundred and seven mechanical movements - north, dug_8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http Mechanical Movements. 93 376. Tread-wheel horse-power turned by the weight of an animal attempting to walk up one side of its interior has been used for driving the paddle-wheels of ferry-boats and other purposes by horses. The turnspit dog used also to be employed in such a wheel in ancient times for turning meat while roasting on a spit. i 377. The tread-mill employed in jails in some countries for exercising criminals condemned to labor and employed in grinding grain etc. turns by weight of persons stepping on tread-boards on periphery. This is supposed to be a Chinese invention and it is still used in China for raising water for irrigation. 578. Saw for cutting trees by motion of pendulum is represented as cutting a lying tree. 379 and 3S0. Portable cramp drills. In 379 the feed-screw is opposite the drill and in 380 the drill spindle passes through the center of the feed-screw. 381. Bowery s joiner s clamp plan and transverse section. Oblong bed has at one end two wedge-formed cheeks adjacent sides of which lie at an angle to each other and are dovetailed inward from upper edge I to receive two wedges for clamping the piece or pieces of wood to be planed. 382. Adjustable stand for mirrors etc. by which a glass or other article can be raised or lowered turned to the right or left and varied in its inclination. The stem is fitted into a socket of pillar and secured by a set screw and the glass is hinged to the stem and a set screw is applied to the hinge to tighten it. The same thing is used for photographic camera-stands. ._ 3S3. Represents the principal elements of machinery for dressing cloth and warps consisting of two rollers from one to the other of which the yarn or cloth is wound and an interposed cylinder having its periphery either smooth-surfaced or armed with brushes teasels or other contrivances according to the nature of the work to be done. These elements are used in machines .

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