Practical Essays on Mill Work and Other Machinery, Volum 1J. Taylor, 1823 - 588 sider |
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Side 6
... equal ; or , in other words , ensure an uniformity of pressure and velocity . Were the teeth of wheels infinitely small , their action would be regarded as that of cylinders , simply touching , having the pro- perty required . The ...
... equal ; or , in other words , ensure an uniformity of pressure and velocity . Were the teeth of wheels infinitely small , their action would be regarded as that of cylinders , simply touching , having the pro- perty required . The ...
Side 8
... equal velocities , whether the wheel drives the pinion , or the pinion the the wheel ; that is to say , that they will move each other as if they merely touched . † tion seems to be , to make the teeth " as small and as numerous as is ...
... equal velocities , whether the wheel drives the pinion , or the pinion the the wheel ; that is to say , that they will move each other as if they merely touched . † tion seems to be , to make the teeth " as small and as numerous as is ...
Side 14
... equal to the circumference of the generating circle CNPC , and each such portion , as CA , or CL , & c . of the base , is equal to each part E A , or G L , of the circumference of of the generating circle . Hence a method of drawing the ...
... equal to the circumference of the generating circle CNPC , and each such portion , as CA , or CL , & c . of the base , is equal to each part E A , or G L , of the circumference of of the generating circle . Hence a method of drawing the ...
Side 16
... equal parts , and the diame- ter A B of the generating circle being half that of K C of the base , when the gene- rating circle is in the middle of its progress , the point C must be in the centre of the circle of the base ; hence we ...
... equal parts , and the diame- ter A B of the generating circle being half that of K C of the base , when the gene- rating circle is in the middle of its progress , the point C must be in the centre of the circle of the base ; hence we ...
Side 19
... equal to A E , then the style placed in E shall have described on the plane of the circle R , a portion CE of an exterior epicycloid , and on the plane of the circle X , a portion HE of an interior epi- cycloid . X FIG . 7 . R B G E F H ...
... equal to A E , then the style placed in E shall have described on the plane of the circle R , a portion CE of an exterior epicycloid , and on the plane of the circle X , a portion HE of an interior epi- cycloid . X FIG . 7 . R B G E F H ...
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Practical Essays on Mill Work and Other Machinery, Volum 1 Robertson Buchanan Uten tilgangsbegrensning - 1823 |
Practical Essays on Mill Work and Other Machinery (Classic Reprint) Robertson Buchanan Ingen forhåndsvisning tilgjengelig - 2018 |
Practical Essays on Mill Work and Other Machinery (Classic Reprint) Robertson Buchanan Ingen forhåndsvisning tilgjengelig - 2017 |
Vanlige uttrykk og setninger
action axis Boulton and Watt breadth of Teeth calculated cast cast-iron gudgeon circle circumference cube root curve cwts cylinder diameter in inches ditto epicycloid equal EXAMPLE feet per second force friction geer geon Hence idem inch pitch inversely iron journal lateral stress length line A B line of centres line of table machine machinery mechanical power mills millwork millwright motion mover moving power multiplied Muschenbroëk number of horses number of teeth numbers in column perpendicular Phil Pitch in inches pitch line practical principles quantity ratio resistance revolutions per minute rule square stave Steam Engine stiffness strain strength in horses Strength of Materials strength of teeth Suppose Table of Pitches teeth in inches teeth of wheels thickness tion tooth torsion trundle Value velocity water-wheel wear weight wheel or pinion wheels and pinions wood wrought-iron gudgeon
Populære avsnitt
Side 119 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Side 120 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Side 331 - By this form they become incomparably stronger and stifier, and give more room for the insertion of muscles, while they are lighter and therefore more agile ; and the same wisdom has made use of this hollow for other valuable purposes of the animal economy. In like manner, the quills in the wings of birds acquire by their thinness the very great strength which is necessary, while they are so light as to give sufficient buoyancy to the animal in the rare medium in which it must live and fly about....
Side 368 - All woods are more tenacious while green, and lose very considerably by drying after the trees are felled The only author who has put it in our power to judge of the propriety of his experiments is Muschenbroek. He has described his method of trial minutely, and it seems unexceptionable. The woods were all formed into slips fit for his apparatus, and part of the slip was cut away to a parallelepiped of one fifth of an inch square, and therefore one twenty-fifth of a square inch in section. The absolute...
Side 122 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Side 199 - ... is driven by a wheel, the number of teeth in the pinion should not be less than eight. When a wheel is driven by a pinion, the number of teeth in the pinion should not be less than ten. The number of teeth in a wheel should...
Side 213 - The arms should become larger as they approach the centre of the wheel, (see Emerson, Prop. 119, Rule 8,) and the eye E, should be sufficiently strong to resist the driving of the wedges, by means of which it is to be fixed on the shaft. This cannot be brought easily to calculation. On the other hand, care must be taken not to make the eye so thick as to endanger unequal cooling. It should be somewhat broader than the breadth of the teeth, in order that it may be the firmer on the shaft: this breadth...
Side 107 - ... circle. It has been supposed by some of the best authors that the epicycloidal tooth has also the advantage of completely avoiding friction ; this is however by no means true, and it is even impracticable to invent any form for the teeth of a wheel, which will enable them to act on other teeth without friction. In order to diminish it as much as possible, the teeth must be as small and as numerous as is consistent with strength and durability ; for the effect of friction always increases with...
Side 136 - A rule, though not absolutely perfect, is better in all cases than to have no guide whatever. "And it is too evident to require proof, that it is essential to the beauty and utility of any machine, that the strength and bulk of its several parts be duly proportioned to the stress, or wear, to which the parts may be subject. "Some general observations on the wheel-work of mills, will serve greatly to simplify our inquiries on the subject.
Side 330 - Here we see the admirable wisdom of the author of nature in forming the bones of animal limbs hollow. The bones of the arms and legs have to perform the office of levers, and are thus opposed to very great transverse strains. By this form they become incomparably stronger and stiffer, and give more room for the insertion of muscles, while they are lighter and therefore more agile ; and the same wisdom has made use of this hollow for other .valuable purposes of the animal economy. In like manner,...