Trunnion

a point from the end equal to the semi-diameter of the trunnion, which is marked on each branch. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

In mortar-vessels other expedients are resorted to, such as trunnion-sights, or a white line painted on the mortar-bed parallel to the axis of the bore when level; but the first plan is preferable. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

The guns 'teams of oxen and horses were being led back into the shelter of the oaks while squads of gunners hoisted the hugely heavy cannon barrels out of their rear travelling trunnion holes and moved them into the forward fighting holes where other men used hammers to fasten the capsquares over the newly placed trunnions. ❋ Cornwell, Bernard (1995)

Pivot-guns have been supplied with trunnion-sights, designed to be used when the ordinary sights do not give the required elevation. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

The axis of the trunnions is to be laid horizontal, either by placing a small level on the trunnions, or, as more exact, by using the trunnion-square. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

The lengths of the trunnions are measured with the foot-rule, and the diameters of the rimbases by that of the exterior rim of the trunnion-gauge. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

Bring the gun under the yard and sling it as follows: place one bight of the slings under the neck of the cascabel, and pass the lashing which is attached to the slings round the chase, at such a distance from the trunnions as will allow them to go into the trunnion-holes without bringing too great a pressure of the slings against the upper port-sill. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

Some late eighteenth century field and siege carriages had a second pair of trunnion holes a couple of feet back from the regular holes, and the cannon was shifted to the rear holes where the weight was better distributed for traveling. ❋ Albert Manucy (N/A)

When the slings bear hard on the upper port-sill, lower the gun-purchase, and bowse on the garnet until the breech is high enough for the trunnions to clear the cap-square bolts in the carriage; then bowse on the thwart-ship-tackle until the trunnions are over the trunnion-holes, lowering the purchase as required to bring the gun into its place. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

It is attached, by a stout thumb-screw, to the axis of the left trunnion, around which it revolves when the screw is slack. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

The trunnion sight, a graduated sight attached to the trunnion, could be used when the muzzle had to be elevated so high that it blocked the gunner's view of the target. ❋ Albert Manucy (N/A)

Scraping and staining gun-carriages or keeping them bright is prohibited; they should be kept well painted, and the trucks, axletrees, and trunnion-holes oiled. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

SIGHTS, for broadside-guns, description and use of 1; 79-83; 288-308 kind of, furnished to the Parrott-rifles 1; 82; 303 for rifled-guns, description and use of 1; 104; 404 trunnion, for mortars and pivot-guns, use, &c., of 3; 71; 225 tangent, to be supplied to all pivot-guns 3; 71; 226 ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

Basic proportions for the carriage were obtained by measuring (1) the distance from trunnion to base ring of the gun, (2) the diameter of the base ring, and (3) the diameter of the second reinforce ring. ❋ Albert Manucy (N/A)

The carriages are also to be carefully examined, the trunnion-holes and arms of the axletrees cleaned, and saturated with boiled linseed oil, the cracks filled with putty, and rubbed smooth, and the trunnion-holes black-leaded. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

The United States siege carriage of the 1860's had no extra trunnion holes, but a "traveling bed" was provided where the gun was cradled in position 2 or 3 feet back of its firing position. ❋ Albert Manucy (N/A)

The remaining parts of the brackets are the trunnion-holes _b_, steps _c_, quarter-rounds ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

In stowing the guns they should be made to rest on one of the skids or bars, a little forward of the base-ring, the muzzle depressed, but not so much as to prevent the use of the sponge to clean out the gun; the axis of the trunnion of each to be inclined the same way, and just enough not to touch the adjoining gun; the vents to be upwards. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)

Use of tangent and trunnion sights brought gunnery further into the realm of mathematical science; the telescopic sight came about the middle of the nineteenth century; gunners were developing into technicians whose job was merely to load the piece and set the instruments as instructed by officers in fire control posts some distance away from the gun. ❋ Albert Manucy (N/A)

An iron cross-head is secured to a stout wooden block which fits into the muzzle, and which has a flange or shoulder to cover the muzzle-face; rings of caoutchouc or gutta-percha are placed between them; an iron rod with a ring in one end, to fit over the trunnion, and with a thread cut on the other end, is used on each side of the gun, to connect the trunnion with the cross-head. ❋ United States. Navy Dept. Bureau Of Ordnance (N/A)