Farm Implements and Farm Machinery, and the Principles of Their Construction and Use: With Simple and Practical Explanations of the Laws of Motion and Force as Applied on the Farm |
Other editions - View all
Farm Implements and Farm Machinery: And the Principles of Their Construction ... John J. Thomas No preview available - 2017 |
Farm Implements and Farm Machinery: And the Principles of Their Construction ... John J. Thomas No preview available - 2015 |
Farm Implements and Farm Machinery, and the Principles of Their Construction ... J J (John Jacob) Thomas No preview available - 2021 |
Common terms and phrases
amount applied ARCHIMEDEAN SCREW attached axle ball becomes board slide body bottom centre of gravity chimney cistern cog-wheel common cord cubic cylinder depth diameter distance double draught draw driving dynamometer earth easily elevated equal exerted fall farm farmer feet foot fork friction fulcrum furrow furrow-slice grain greater half handle harrow heat heavy Hence horse horse-power hundred implement inches inclined plane increased iron kind knee-joint labor latent heat less lever load machine miles an hour mode momentum motion mould-board move nearly passing pipe piston placed pounds pressure prevent principle pulley pump raised rake reaper represented resistance revolving rise road screw shown in fig side soil specific gravity square steam-engine stone stream strength STRENGTH OF MATERIALS subsoil surface teeth thrashing thrown tion tube turning upward velocity vessel wagon weight wheel whiffle-tree wind wind-mill wood
Popular passages
Page 269 - Its aliment is coal, wood, charcoal, or other combustible ; it consumes none while idle ; it never tires, and wants no sleep ; it is not subject to malady when originally well made, and only refuses to work when worn out with age ; it is equally active in all climates, and will do work of any kind ; it is a water-pumper, a miner, a sailor, a cotton-spinner, a weaver, a blacksmith, a miller, &c.
Page 269 - It regulates, with perfect accuracy and uniformity, the number of its strokes in a given time, counting or recording them moreover, to tell how much work it has done, as a clock records the beats of its pendulum ; it regulates the quantity of steam admitted to work ; the briskness of the fire ; the supply of water to the boiler ; the supply of coals to the fire ; it opens and shuts its valves with absolute precision, as to time and manner ; it oils its joints ; it takes out any air which may accidentally...
Page 18 - ... the force, and so on. A body moving at the rate of two feet per second, possesses twice the momentum of another of equal size with a velocity of only one foot per second. A musket ball, weighing one ounce, flying with fifty times the speed of a cannon ball weighing fifty ounces, would strike any object with equal force ; or if they should meet each other from opposite directions, the momentum of both would be mutually destroyed, and they would drop to the earth. Where the mass is very great,...
Page 210 - Substances. 23 cubic feet of sand, 18 cubic feet of earth, or 17 cubic feet of clay, make a ton. 18 cubic feet of gravel or earth before digging make 27 cubic feet when dug; or the bulk is increased as three to two.
Page 69 - He further adds, in speaking of the improvements in roads made by Marshal Wade in the Scottish Highlands, " His military road is said to have done more for the civilization of the Highlands than the preceding efforts of all the British monarchs. But the later roads under the more scientific direction of Telford, produced a change in the state of the people which is probably unparalleled in the history of any country for the same space of time. Large crops of wheat now cover former wastes ; farmers...
Page 269 - In the present perfect state of the engine it appears a thing almost endowed with intelligence. It regulates with perfect accuracy and uniformity the number of its strokes in a given time, counting or recording them, moreover, to tell how much work it has done, as a clock records the beats of its pendulum ; it regulates the quantity of steam admitted to work; the briskness of the fire; the supply of water to the boiler ; the supply of coals to the fire ; it opens and shuts its valves...
Page 111 - ... for, besides the increase of draught caused by gravity, the power of the horse is much diminished by fatigue upon a long ascent, and even in greater ratio than man, owing to its anatomical formation and great weight. Though a horse on a level is as strong as five men, on a grade of 15 per cent, it is less strong than three; for three men carrying each 100 pounds will ascend such a grade faster and with less fatigue than a horse with 300 pounds.
Page 269 - ... of water to the boiler ; the supply of coals to the fire ; it opens and, shuts its valves with absolute precision as to time and manner ; it oils its joints; it takes out any air which may accidentally enter into parts which should be vacuous ; and, when any thing goes wrong which it can not of itself rectify, it warns its attendants by ringing a bell.