When equatorial mountings for telescopes became more general, no filar micrometer was considered complete which was not fitted with a position circle.'
In regard to the constitution and maintenance of the naval forces, the administration of the arsenals is divided into three principal departments, the first concerned with naval construction, the second with ordnance, including gun-mountings and small-arms, and the third with the so-called submarine defences, dealing with all torpedo materiel.
Namako for (fish-roe) grounds were essential for the mountings Scuiptiwed - Decoration.
In coast defence artillery, owing to the fact that the guns are on fixed mountings at a constant height (except for rise and fall of tide) above the horizontal plane on which their targets move, and that consequently the angle of sight and quadrant elevation for every range can be calculated, developments in sights, in a measure, gave way to improved means of giving quadrant elevation.
Guns on field mountings; these sights admit of continuous laying, the eye need not be removed when the gun is fired.
Shield sights were introduced for disappearing mountings to admit of continuous laying for line, and a disk engraved for yards of range duly corrected for height, and called an " elevation indicator," replaced the index plate and reader.
The improvements in gun mountings mentioned above led the way to the introduction of the automatic sight.
On account of the slow rate of fire imposed by black powder, the rapidity of laying conferred by its use was of no great advantage, and it was unsuited to the imperfect mechanical arrangements of the gun mountings of the time.
Clarke, when he, as superintendent of the Royal Carriage Factory, had brought gun mountings to such a pitch of perfection that it could be usefully employed.
Raining dials placed on the mountings where they can be read by the layers, and more accurate elevation indicators have made laying by quadrant elevation, and in certain cases giving direction by means of graduated arc and pointer, both accurate and rapid, so that once more this system of laying is coming into favour for long ranges.
Toothed gearing connected with the gun mountings actuates a rack attached to the standards carrying the sights, so that any movement of the gun mounting is communicated to the sights.
But after the discontinuance of this firm that of Repsold again came to the front, not only in the construction of transit circles, but also of equatorial mountings and more especially of heliometers (see Micrometer) .
The massively moulded ormolu stair balustrade of Northumberland House, now at 49 Prince's Gate; the candelabra at Windsor and Buckingham Palace, produced in Birmingham by the firm of Messenger; the cast-iron railings with javelin heads and lictors' fasces, the tripods, Corinthian column standard lamps and candelabra, boat-shaped oil lamps and tent-shaped lustres with classic mountings, are examples of the metal-work of a style which, outside the eccentric Brighton Pavilion and excursions into Gothic and Elizabethan, was universally accepted in the United Kingdom from the days of the Regency until after the accession of Victoria.
Our limits forbid a historical account of the earlier endeavours to fulfil these ends by means of motions in altitude and azimuth, nor can we do more than refer to mountings such as those employed by the Herschels or those designed by Lord Rosse to overcome the engineering difficulties of mounting his huge telescope of 6 ft.
- Equatorial mountings may be divided into six types.
Mountings of types A and B - that is, with a long polar axis supported at both ends - are often called the" English mounting,"and type C, in which the declination axis is placed on the extension of the upper pivot of the polar axis, is called the" German mounting,"from the first employment of type C by Fraunhofer.
Aperture employed at Paris and other French observatories, of which the object-glasses were made by the brothers Henry and the mountings by Gautier of Paris.
The chief defect in equatorial mountings of type C is that in general they are not capable of continued observing much past the meridian without reversal.
Deductions as above under clause C, except that one-third be deducted off ironwork of masts and spars, repairs to and renewal of all machinery (inclusive of boilers and their mountings), and all hawsers, ropes, sheets and rigging.