The sight drops through a socket in a pivoted bracket which is provided From Treatise on Service Ordnance.
These coils are placed with their axes at right angles to one another, and at the point where the axes intersect a small pivoted needle of soft iron is placed, carrying a longer index needle moving over a scale.
In this sight both hind and fore sights are fixed on a rigid bar pivoted about the centre; the rear end is raised or depressed by a rack worked by a hand-wheel; ranges are read from the periphery of a drum; the fore-sight and leaf of the hind-sight are provided with small electric glow lamps for night firing.
If a .JP solid circle be fixed in any one position and a tube be pivoted on its centre so as to move; and if the line C D be drawn upon the circle pointing towards any object Q in the heavens which lies in the plane of the circle, by turn ing the tube A B towards any other object P in the plane of the circle, the angle B 0 D will be the angle subtended by the two objects P and Q at the eye.
The rod N is then lowered and allows the indicating finger 0, which is pivoted at P, to fall until it rests on the stirrup R, which is part of the hanger D.
The extension of 0 holds down the right-hand end of the rod S which is also pivoted at P, and enables its end to fit into one of the three inverted steps on the bottom of the shoot Q.
With that, he pivoted on one heal and walked away.
She pivoted around, as far as her seatbelt allowed, practically hanging over the seat as she looked out the back window.
In Scott's sight, mark iv., there is a longitudinal level pivoted at one end and provided with a degree scale up to 4°; the level is moved by a spindle and micrometer screw reading to 2'.
The rocking-bar consists of a carrier a fixed to the cradle, a rockingbar d pivoted to the carrier at e, a sight bar f carrying the sights and sighting telescope.
The small pivoted iron needle ns placed in their common field therefore takes up a certain position, dependent on the relative value of these fields.
In the other gap are pivoted two coils wound on an iron core and connected at nearly a right angle to each other.
The opening bridge between the river towers consists of two leaves or bascules, pivoted near the faces of the piers and rotating in a vertical plane.
The movable system is suspended or pivoted, and when a P. D.
Constant magnetic field, and in the interspace between the poles is fixed a delicately pivoted coil of wire carried in jewelled bearings.
In order to obtain the declination a pivoted magnet is used to obtain the magnetic meridian, the geographical meridian being obtained by observations on the sun or stars.
The Arab traders in the Levant certainly used a floating compass, as did the Italians before the introduction of the pivoted needle; the magnetized piece of iron being floated upon a small raft of cork or reeds in a bowl of water.
The earliest unquestionable description of a pivoted compass is that contained in the remarkable Epistola de magnete of Petrus Peregrinus de Maricourt, written at Lucera in 1269 to Sigerus de Foncaucourt.
He then describes a new compass with a needle thrust through a pivoted axis, placed in a box with transparent cover, cross index of brass or silver, divided circle, and an external "rule" or alhidade provided with a pair of sights.
Prior to this clear description of a pivoted compass by Peregrinus in 1269, the Italian sailors had used the floating magnet, probably introduced into this region of the Mediterranean by traders belonging to the port of Amalfi, as commemorated in the line of the poet Panormita: "Prima dedit nautis usum magnetis Amalphis."
Da Buti, the Dante commentator, in 1380 says the sailors use a compass at the middle of which is pivoted a wheel of light paper to turn on its pivot, on which wheel the needle is fixed and the star (wind-rose) painted.
B is the bob of a pendulum, with its style s passing through a slot in the short arm of a light lever, sop, pivoted at o, and with its outer end resting upon a revolving cylinder covered with smoked paper.
Here the style s of the pendulum rests in slots in the short arms of two writing levers pivoted at o and o'.
In practice the weight b is pivoted on the rod whilst its outer end, bp, which writes on a smoked surface, is made extremely light.
1 In this case the visible indication consisted in the attraction exerted between the electrified body and the light pivoted needle which was acted upon A, ' j+ C and electrified by induction.
Oersted's important discovery was the fact that when a wire joining the end plates of a voltaic pile is held near a pivoted magnet or compass needle, the latter is deflected and places itself more or less transversely to the wire, the direction depending upon whether the wire is above or below the needle, and on the manner in which the copper or zinc ends of the pile are connected to it.
C. Schweigger (1779-1857) with his " multiplier " made an advance upon Oersted's discovery, by winding the wire conveying the electric current many times round the pivoted magnetic needle and thus increasing the deflection; and L.
The square piece of aluminium is pivoted round a horizontal stretched wire.
Sists of two superposed elastic screws (a a, b b), the upper of which (a a) is fixed in a vertical frame (c), which is pivoted in the central part (d) of the under screw.
There were also side aeroplanes arranged in tiers, and large aeroplanes in front, which were pivoted and served for vertical steering.
The rudder for lateral steering was placed about 21 metres behind the main surfaces and was formed of two vertical pivoted aeroplanes.
In a machine of any kind, each point describes a curve; a simple but important instance is the " three-bar curve," or locus of a point in or rigidly connected with a bar pivoted on to two other bars which rotate about fixed centres respectively.
The flitch-plate rests at one end on the top of this cam, and at the other end is shackled to the horizontal arm of a bell-crank lever which is pivoted on the frame.
In the disk plough, which is built both as a riding and a walking plough, the essential feature is the substitution of a concavo convex disk, pivoted on the plough beam, for the mould-board and share of the ordinary plough.
The effect of these is beautifully illustrated by a model consisting of a number of little compass needles pivoted on sharp points and grouped near to one another upon a board, which is placed inside a large magnetizing coil.
The downward tendency of the north pole of a magnet pivoted in the usual way had been observed by G.
In its simplest form an electromagnetic ammeter consists of a circular coil of wire in which is pivoted eccentrically an index needle carrying at its lower end a small mass of iron.
In this magnetic field is pivoted a small circular or rectangular coil carried in jewelled bearings, the current being passed into and out of the movable coil by fine flexible conductors.
19, consists of an armature a, pivoted at one end h in a slot at one end N of a permanent magnet m, the other pole s of which is fixed to the yoke y of a horse-shoe electromagnet M.
The receiving apparatus consisted of a multiplier, in the centre of which were pivoted one or two magnetic needles, which either indicated the message by the movement of an index or by striking two bells of different tone, or recorded it by making ink dots on a ribbon of paper.
The derrick crane introduces a problem for which many solutions have been sought, that of preventing the load from being lifted or lowered when the jib is pivoted up or down to alter the radius.
Here the place of the jib is taken by two inclined legs joined together at the top and pivoted at the bottom; a third back-leg is connected at the top to the other two, and at the bottom is coupled to a nut which runs on a long horizontal screw.