"Electrical power and construction appli ances" such as generators, motors, wiring de vices, controlling and measuring devices, light ing arrangements, electric furnaces, heaters, fans, searchlights and drilling machines.
"Navigation appliances" used for operating gears, shop tools, screw threads, hoists, stamp mills, saws, punches, shears, bending machines, grinding machine, cotton presses, looms, knit ting machines, etc.
"Engineering construction appliances," such as mixing machines, testing machines, stump and pile pulling machines, blocks and tackle, hoisting machines, tackles hooks, pile drivers, automatic dumps and dumping cars, stone grips, derricks, conveyors, timber splicers, metal weld ing devices, tools, wood-preserving apparatus, cable carriers, dams and embankment escala tors and moving platforms, "Ferris" wheels, high structures and buildings, roof and bridge trusses, trestles and bridges.
steamships, sailing vessels and yachts, such as sails, rope knots, block and tackle, paddle wheels, screw propellers, steering gear, anchors, windlasses, capstans, cranes, etc.
"Road appliances," used in the construction of roads, highways and railroads, such as scrapers, rollers, excavators, vehicles, automo biles, bicycles, motor adjuncts, wheels, road gates, lamps, etc.
"Gearing? consisting of rack and pinion de vices, spiral, elliptical and worm gears, differ ential and stop-motion gears, and epicyclical and planetary trains.
"Motion and controlling devices," consisting of rackets and pawls, cams and volute cams, cranks and variable cranks, intermittent and "Agricultural machines and implements," such as plows, tethering hooks, wash boilers, washing machines, mowers, grain harvesters, threshing machines, cream separators, refriger ating machinery, cold storage houses, refuse crematories, silos, kilns, ovens and furnaces.
"Draughting devices," such as dividers, dot ting pens, parallel rules, curve delineators, trammels, ellipsographs, pantographs, etc.
"Tools? hand and machine, such as saws, chisels, mallets, planes, borers, etc.
"Perpetual motion devices," consisting of various forms of hydraulic, hydrostatic and magneto-electric apparatus.
Bibliography.-- For descriptions of a great variety of special movements, appliances and devices, consult the works on the subject by Hiscox, Rheile, Ruleau and Spon, also the special articles on the various forms of appli ances enumerated under the general classes stated in this article.