How then can the tractive resistance of locomotives at low speeds, which you say is entirely made up of friction, be so little as 1/500th.
It has not been applied to the vessels themselves, as in the case of screw vessels, but it has been employed on shore to ascertain the amount of tractive force that a paddle vessel can exert on a rope.
Upon well formed railways with carriages of good construction, the average tractive force required for low speeds is about 7-1/2 lbs.
What is the amount oftractive force requisite to draw carriages on railways?
The tractive force of paddle wheel steamers is ascertained by a dynamometer fixed on shore, to which the floating vessel is attached by a rope.
It does not show up in grate surface, tractive power, or weight on the drivers.
The crowded rip tracks reflect the tractive power of the big engines.
The revolution in standards of power and equipment incident to recent years of tractive units and ton-mile costs has brought the mechanical man prominently in front of the headlight.
When this weight fails to earn a credit in the way of tractive efficiency, it should not be present.
Some years ago the writer, in making studies for grade revision, found that the tractive power of a locomotive up grade becomes less as the length of the grade increases, and in some unknown proportion.
The dynamometer car is constructed to indicate thetractive effort of the engine, the speed, and the distance travelled.
Thus, without reckoning the curve friction of the whole train and the journal friction of the wagons, both uncertain quantities, the proportion of developed tractive power to load was as 1 to 3.
In calculating the tractive power of the engine, the effective pressure in the cylinders may be reckoned at fully nine-tenths of the boiler pressure, on account of the low piston speed.
This engine was built for tractive power, not speed, and eighteen miles an hour is the highest rate registered over the short straight course available.
Their tractive power can be nearly doubled without any increase in weight, enabling them to draw heavier trains and surmount steeper grades without imposing additional weight or strain upon bridges and other parts of the roadbed.
It will be apparent at once that a method of increasing the tractive power of the present steam locomotives by more than 50 per cent.
We have here a model of a second motor car equipped with the apparatus, mounted on a section of track and provided with means for measuring the amount of tractive force exerted both with and without the passage of the current.
It is therefore probable that a portion of this increased tractive adhesion is due directly to the current itself aside from its heating effect, although I have not as yet been able to ascertain this definitely.
In fact, it is to this use of the waste steam that we owe the practical success of the locomotive-engine as a tractive power on railways, especially at high speeds.
Thirtieth street the station is at the foot of the steepest grade, thus testing to the utmost the tractive capacity of the motor.
To the mind of the mechanical engineer, having in view the ordinary coefficients of tractive ability, there is no remedy for this.
But, singular to say, the directors had not yet decided as to the tractive power to be employed in working the line when opened for traffic.
As the period drew near for the opening of the line, the question of the tractive power to be employed was anxiously discussed.
They were no longer experimental, but had become an established tractive power.
They also discussed the kind of tractive power to be employed: Mr. Pease stating that the company had based their whole calculations on the employment of horse power.
Steam or gasoline tractors of the wheel or track-laying type are required to furnish the tractive effort needed to haul these huge plows.
A rolling disk takes the place of the moldboard and share, and in this way friction is reduced very materially, with the result that less tractive effort is required to draw the machine.
This machine was able to travel at a rate somewhat slower than that at which a man usually walks; and its tractive force was that of four horses.
In 1904 the first one of this type was placed in operation on an American railroad, and since that time has gained favor where maximum tractive power on heavy grades is required.
Additional drivers were added with the demand for increased tractive power, leading in turn to the development of the "Mogul" and "Consolidated" types.
The result obtained is known as the "co-efficient of tractive resistance.
When we trace the curve of the tractive stresses in a boat thus constructed, by putting the speeds in abscisses and the tractive stresses in ordinates, we obtain a curve (Fig.
Diagram of variations in tractive stresses and tonnage taken as a function of the speed.
The corresponding tractive stresses have been reduced to the same transverse section as in the Pictet model in order to render the observations comparable.
Gitana, which is the sharper, runs easier and requires a slighter tractive stress.
The water escapes in a thin and even sheet as soon as the tractive stress exceeds 2,000 kilogrammes; and the intensity and size of the eddies from the boat sensibly diminish in measure as the speed increases.
A chart whereby you can find the tractive power or drawbar pull of any locomotive without making a figure.
If a carriage be drawn, the traces are stretched by the tractive power, by the same tension that would be given to them if a certain weight were appended to them.
If only one propeller is employed, horizontal rudder planes must be disposed at such angles and in such positions as to compensate for the improper position of the tractive force.
The next step was obviously to get rid of the tractivevehicle and tow rope by carrying propelling machinery on the kite.
This feature gave the Norris 4-2-0’s greater adhesion and tractive force.
The heavier engine doubtless possesses greater tractive power, but apart from the question of tractive power is the all-important one of steadiness and safety on the rails.
The hard coal burners, accordingly, having from this cause somewhat more adhesion than the soft coal burners of the same class, have proportionately more tractive power, and will haul loads from ten to fifteen per cent.
This plan of engine was first patented by Septimus Norris, of Philadelphia, in 1846, and the original design was apparently to produce an engine which should have equal tractive power with the Baldwin six-wheels-connected machine.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tractive" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: draft; drawing; hauling; pulling
