ROLLO 



667 1 



ROLLS-ROYCE 



and sailed up the Seine to Jumi- 

 eges and Rouen, 876. Fortifying 

 Rouen, he extended his power in 

 Neustria, besieged Paris, 886, and 

 captured Evreux, Bayeux, etc. By 

 the treaty of St. Clair-sur-Epte, 

 911, Rollo was baptized as Robert 

 at Rouen, his capital, is said to 

 have married Gisele, daughter of 

 the king, and received the territory 

 thereafter called Normandy and 

 the suzerainty of Brittany. His 

 strong, able rule brought prosper- 

 ity, and, abdicating power to his 

 son William in 927, he died in 932. 



Rollo, BARON. Scottish title 

 borne by the family of Rollo since 

 1651. Sir Andrew Rollo, whose 

 estates were at Duncrub, Perth- 

 shire, was the first holder, Charles 

 II creating him a baron during his 

 stay in Scotland in 1651. Robert, 

 the 4th baron, was concerned in 

 the Jacobite rising of 1715, and 

 from him the title passed from one 

 descendant to another until in 1916 

 it came to William Charles, as llth 

 baron. Lord Rollo sits in the 

 Lords as Baron Dunning, a title 

 created in 1869. The seat is Dun- 

 crub Park, Dunning, Perthshire. 



Roll of Honour. The heading 

 given to the casualty lists as they 

 appeared day by day hi the press 

 during the Great War. Besides the 

 main roll nearly every town and 

 village, and every large industrial 

 undertaking, every large office, 

 every large school, had its roll of 

 honour, giving the names of those 

 who served and of those who 

 suffered in the War. An official 

 publication in 89 volumes contain- 

 ing the names of soldiers who died 

 in 1914-19 was begun in 1920. (See 

 Casualties.) 



The term is sometimes used for 

 the national roll of honour, called 

 also the King's National Roll (q.v.). 



Rollright, GREAT AND LITTLE. 

 Two villages of Oxfordshire, Eng- 

 land. They are situated in the 

 Cotswold Hills, 3 m. N. and N.W. 

 respectively of Chipping Norton, 

 and have a total pop. of about 400. 

 Half a mile from Little Rollright, 

 on the county boundary, are the 

 Rollright Stones, the most im- 

 portant megalithic remains in 

 England after Stonehenge. The 

 isolated King's Stone and the 

 clustered Whispering Knights are 

 the chief stones left. 



Rolls, CHARLES STEWART (1877- 

 1910). British engineer and air- 

 man. Born in London, Aug. 28, 

 1877, a younger son of the 1st Baron 

 Llangattock, he was educated at 

 Eton and Trinity College, Cam- 

 bridge, where he was a prominent 

 cyclist. After some engineering 

 work at Crewe, Rolls devoted his . 

 time to popularising the motor-car 

 in England. He competed in races, 



Rolls Ore Crusher. Diagram illustrating the type in use 

 in the Cornish copper mines. A A 1 . Rolls. B. Hopper 

 holding ore. C. Rotary sieve delivering fine crushed ore 

 to wagon and coarse ore to elevator, D, which returns 

 it to the rolls to be recrushed 



company 



investigated new designs, and 

 formed for their manufacture the 

 which became Rolls- 

 Royce, Ltd. 

 About 1901 he 

 turned his at- 

 tention to 

 aeronautics, 

 and, making 

 many daring 

 flights, was 

 soon one of the 

 best known of 

 Charles Stewart Rolls, British air- 

 British engineer men- He won 

 Elliott & F ry several tro- 



phies, and in 1910 crossed and re- 

 crossed the English Channel in 95 

 minutes, then a notable feat. He 

 was killed while flying] at Bourne- 

 mouth, July 12, 1910. ' There is a 

 statue to him in the market square 

 at Mohmouth. 



Rolls Chapel. Old London 

 building. It stood in Chancery 

 Lane, E.G., on ground now covered 

 by the W. part of the Public Re- 

 cord Office (q.v.). The original 

 chapel and house were built by 

 Henry III in 1233 for converted 

 Jews and their governor or mas- 

 ter. In 1377 buildings were as- 

 signed to the master of the rolls, 

 who held his court here until 1882, 

 and was known until 1873 as 

 keeper of the house of converts. 

 The chapel was rebuilt by Inigo 

 Jones in 1617, and Rolls House in 

 1717-25. Donne, Burnet, Atter- 

 bury, and Joseph Butler were 

 among the preachers in the chapel, 

 interesting monumental remains 

 from which, including the tomb of 



John Young 

 master of the rolls 

 to Henry VIII, are 

 in the Record 

 Office museum, 

 with which parts 

 of the old chapel 

 were incorporated 

 in 1896-97. 



Rolls Ore 

 Crusher. Ma- 

 chine used for 

 crushing ore. Rolls 

 were probably first 

 used at the tin and 

 copper mines of 

 Cornwall. A typi- 

 cal Cornish crush- 

 ing mill consists of 

 two h o r i zontal 

 rollers, 2 ft. in 

 diameter and 10 

 ins. wide on the 

 face, fixed in a 

 frame with their 

 rounded surfaces 

 just, or not quite, 

 touching ; they re- 

 volve in opposite 

 directions at the 

 same speed. One 

 fixed bearings, and 

 in sliding bearings ; 



revolves i 

 the other 



the pair are kept up to their work 

 by means of long levers with heavy 

 weights on their outer ends, and 

 the others connected with the slid- 

 ing bearings of the free roll. 



The weights determine the pres- 

 sure with which the rolls are forced 

 together, and, therefore, the fine- 

 ness of the crushing or the quan- 

 tity of ore passed per hour. The ore 

 is fed into a hopper or bin fixed 

 over the rolls, and after it has 

 passed through is sieved, and the 

 coarser portions returned to the 

 rolls to be crushed again. In more 

 modern mills the rolls may have 

 wider faces, springs take the place 

 of weighted levers, and more com- 

 pact arrangements may be made 

 for returning the partly crushed 

 ore to the rolls. The Krom rolls, 

 largely used in the U.S.A., are 

 merely improved Cornish mills. 

 Mills with toothed rolls, such as are 

 used for making cubes of stone for 

 macadam or concrete, are some- 

 times used for the preliminary 

 crushing of the ore. 



Rolls-Royce Aero Engine. 

 Type of engine developed and 

 manufactured during the Great 

 War by Rolls-Royce, Ltd. It is 

 made in four sizes, the Hawk 

 (75-100 h.p.), the Falcon (190- 

 275 h.p.), the Eagle (250-375 h.p.), 

 the Condor (650 h.p. ). The Hawk 

 engine is a small six-cylinder verti- 

 cal engine driving an air-screw 

 direct ; the remaining three types 

 are all 12-cylinder engines with 

 two rows of six cylinders inclined 



