Just in front of the doorway, which was fifteen Roman feet wide, are the large stones with holes for the pivots on which the massive double doors swung (indicated in Fig.
It seems strange that ancient builders did not use smaller pivots of solid metal, on which the doors would have turned much more easily; but a conservative tradition in this regard prevailed against innovation.
This has the appearance of a double door, but it is made of a single slab of marble, and swings, like an ordinary Roman door, by means of pivots which are fitted into sockets in the threshold and lintel.
A Chifney bit, as it pivots on the mouthpiece, avoids this; its action is quite independent of the headstall, and is precisely on the parts where it is originally placed.
It has the horizontal racking motion mentioned above, and revolves either on upper and lower pivots supported by the structure of the workshop, or on a fixed pillar secured to a heavy foundation.
The pivotson which it turns must be exactly on the same level; they must point exactly east and west, and the axis of the telescope must be exactly at right angles to the line joining the pivots in all positions of the instrument.
Similarly, if the pivots of the telescope are precisely on the same level, the centre wire of the right ascension series would coincide with its reflected image.
This is the most common construction of present-day manufacture and is utilized in three-quarter plate or separate and combination bridges covering one or more pivots of train wheels.
Their outer extremities are formed into the pivots on which the cylinder rotates.
FRAME—The plates or plate and bars of a watch or clock which support the pivots of the train.
Yet it is interesting and touching that the maidens of your politer circles, gasping in pinched waists, and balancing and tottering on pivots under their shoes, should inquire with so amused an air about the squeezed feet of Chinese ladies.
Master," said he, "this can only come from the wear of the pivots and gearing.
He made sure, by a scrupulous examination, that the wheels were in good condition, the pivots firm, the weights exactly balanced.
The barrel arbor pivots are sometimes necessarily of large diameter, and the bearing surfaces can be made shorter in proportion, as the surfaces will then be great enough to give good results as well as to retain (48) the oil.
Its click should have the pivots of its arbor oiled, while what was said of clicks in general will apply here.
This disk, being turned true on its circumference, was supported by a spindle terminating in pivots 0.
How much these results would be altered by the use of a disk of such weight, and pivots of such proportionate size, as to meet the actual requirements in horology, remains to be ascertained.
The Balance Arbor Pivots and Bearings~, as well as those of the lever and scape wheel where their pivots run in capped jewels, deserve particular attention.
The film of oil which must be interposed between the bearing surfaces of the journal, or pivot, and its bearing, will also occupy some space; and this must be remembered, particularly in the case of pivots in the escapement.
The length of the bearing surfaces of the pivots remote from the motive force can be made shorter in proportion.
Rigg; especially are they not applicable to the friction of pivots in the escapement, where the laws of fluid friction are more nearly applicable; and when it is remembered that the weight of the disk was 86 pounds, and the pivots .
With a perfect, non-drying, non-oxidizing lubricant, steel bearings for pivots would be preferable to brass bearings.
In both a watch and clock thepivots are pressed against the sides of the pivot holes, either by the motive force or by gravity.
The sweep on the bow-pivots includes an arc of about 120 degrees.
In these crosspieces are holes sheathed with iron, and into them pivots are introduced, and thus the screw is turned by the treading of men.
The heaven revolves steadily round earth and sea on the pivots at the ends of its axis.
So, when yokes of oxen began to draw the four-inch frame, they made the shaft revolve constantly, turning it by means of the pivots and rings.
In the ends he fixed pivots and rings in the same way.
The pivots of this windlass, lying as centres in right lines in its socket-pieces, and the handspikes inserted in its holes, make the load rise when the ends of the windlass revolve in a circle like a lathe.
In these grooves are closely fitted two sliding blocks, carrying pivots E F, which may be fastened to the sliding blocks, while leaving them free to slide in the grooves at any adjusted distance apart.
All pivots have a tendency to draw the oil away from the jewels, and particularly the conically formed variety, which develops a strong capillary attraction.
Finish the ends of the pivots flat and round the corners off slightly; and right here comes a point worthy of consideration in all watch work.
On the other hand, one often sees staffs whose pivots are faultless in shape, but the execution and finish so bungling as to offset all the good qualities as regards shape.
A being used for turning the staff down in the rough; B for the conical pivotsand square shoulders and C for the under-cutting.
The proper shape for balance pivots was shown in Fig.
The turning up of a new pivot does not differ in any way from the instructions given for turning pivots on a new staff.
Hence the pivots already mentioned wear unequally at different points, and tend to alter their figures.
But a limit is put to the diminution of the radii of journals and pivots by the conditions of durability and of proper lubrication, and also by conditions of strength and stiffness.
Pivots require great hardness, and are usually made of steel.
The rear tips of these two surfaces, however, work on pivots in connection with the main elevating plane which is set out in front.
The two vertical surfaces swing on pivots and are controlled by wires connecting with the direction steering wheel.
Affixed to the top lame, back and front, were four or more bowed lames passing over the shoulders and working freely upon the pivots which secured them.
Under the hinges orpivots of the visor are the upper parts of the two chin-pieces, hinged to the crown, which overlap in front and are strapped together at the chin.
The pivots for the visor are in the reinforcement in this case.
This revolves upon pivots fastened well back, and not only protects the face, but partly fulfils the duty of a gorget.
The pivots for the propellers were flat-head wire nails small enough for the blades to revolve freely, but driven securely into the air-ships.
By remembering this rule, and placing pivots in various positions, a wide range of proportions is possible.
The joints d, e, and f are alsopivots moving with the pantagraph.
Different proportions between original and reproduction may be obtained by shifting the position of pivots e and f.
We can also understand, after a little thought, that such a balance would exert as much breaking force on its pivots as a balance of the same weight, but ¾" in diameter acting against a very much stronger hairspring.
The idea is, the pieces T p act like a lathe dog to convey the power from one of the pivots of an old eight-day spring clock movement, which is secured by screws to the lower side of the main plate A.
We do not think it advisable to try to use a split chuck, although we have seen workmen drive the shell A A''' out of the collet D and then turn up the pivots y z in said wire chuck.
The top pivots to the escape wheel should be capped with imitation rubies for appearance sake only, letting the cap settings be red gold, or brass red gilded.
The bridge F G carries the top pivots of escape wheel and pallet staff, and is shaped as shown at the full outline.
These pillars furnish support for sliding centers which hold the top pivots of the escape wheel and pallet staff while we are testing the depths and adjusting the pallet stones.
Then the armature A, which swings freely on the pivots M in front of the poles N S, is very little attracted and the spring W pulls the same way from the poles into the position indicated in the diagram.
This column also affords a support for the pivots p p, and is fastened upon a solid bracket or projection, P, which extends from the base of the machine, and is cast in one piece with the same.
If the back of the ruby pin strikes the fork there will be a greater tendency of breaking it and injuring the pivots on account of acting like a wedge.
The bankings should be placed towards the acting end of the fork as illustrated, as in case the watch "rebanks" there would be more strain on the lever pivots if they were placed at the other end of the fork.
He therefore made the new clock, put it up, and then departed, carrying with him all the brass wheels, pivots and things the thrifty Ipswich fathers had discarded.
Within the partition a, there are movable brasses l, for the pivots of i and k, shewn in fig.
Behind the standard, supporting the back pivots of the shafts B B of the cutter, is a frame l, with a screw m tapped through it.
The wet cloth is first to be coiled upon a roller, and then placed in the carriage, as at f, with its pivots bearing upon inclined planes.
For this purpose, the crane turns on pivots at top and bottom; and the goods are raised or lowered at pleasure, with double pulleys and sheaves, by means of a cylinder moved by cast-iron wheels.
This regulating roller g, is mounted by itspivots in bearings on the circular arms h, shown by dots.
The roller which is immediately over it, is borne down by a heavy weight, suspended from hooks, which are over thepivots of the upper roller.
M is the guide roller, having its pivots movable laterally to adjust the wire and keep it parallel.
The doffing combs, X X X, are formed to the shape of the card barrels, and are attached to straight bars extending along the machine on both sides, which are supported at their extremities by levers Y Y, vibrating upon fulcrumpivots at w w.
The inferior pivots of the two pieces are supported by screw-sockets, working in an iron screw-nut sunk into the summer-bar F.
When the dyeing-frame is raised out of the copper, the whole of the suspenders or blocks are reversed, by turning the apparatus over upon the pivots e e, and thus the whole surfaces of the hats are equally acted upon by the dyeing material.
The indented corners, where the pivots of the doors were placed, and the slot for the lower bolt of the door near the centre, should be noticed.
More than one method was in use for fixing the pivots of the doors and enabling them to turn easily.
When the top is quite complete these pivots may be glued into the holes in the box for greater security.
It is a convenience in making this toy to let the cover form one side, the cover being left off until all the inside arrangements are complete; the pivots can then be put into their holes in the cover, and the cover put on.
The portions marked M and N turn onpivots h k and m l.
See that the arms, legs and feet turn easily on their pivots, whether these pivots be paper-fasteners, cane or knitting needles.
These pivots pass through holes, D and E, in the figures and through holes made at each side of the box exactly opposite the short slits.
Mr Simms, at my request, changed the bearings in Y's for bearing in segments of circles, a construction which has worked admirably well in the pivots of the Transit Circle.
An examination of the results of observations had made me dissatisfied with the bearings of the horizontal pivots in their Y's.
I also furnished Mr Sheepshanks with investigations regarding the form of the pivots of the Cape Circle.
This collar carries the pivots Q for levers I, so that, by shifting O, the position of I is varied, hence the point at which L will act upon the end of I and lift it to release H is adjustable.
The arm M that supports the two lower feed gears pivots upon the outboard end of the back bushing, hence its centre coincides with that of the spindle.
At E is the pin on which the tool box pivots to swing it at an angle.
This plug carries at its centre a cylindrical pin on which pivots the arm A.
Under the pivots of swinging bridges several thousand pounds per square inch have been found to work, and for iron journals 800 lbs.
Midway between pivots J J and the ends of the gauge tongues, is the centre or tool carrying spindle O.
I have known of several thousand pounds pressure per inch being reached on the slow-working and rarely moved pivots of swing bridges.
To steady B there is provided (in addition to the pivots at d) on A two lugs f, between the vertical surfaces of which B is a close working fit.
E' is a tubular pivot or stud fixed on the centre line of pivots E and D, and distant from the edge of A A to the same amount that E is.
To adjust the fit and take up the wear at the pivots d they are made slightly taper, fitting into correspondingly taper holes in B.
In the governor of the Buckeye engine, the centrifugal force may be varied by increasing or diminishing the distance of the weights from the pivots of the arms on which they swing.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "pivots" in a variety of sentences. We hope that you will now be able to make sentences using this word.
