roller-flag 
to warn boats against attempting to land during 
the prevalence of the rollers. 
roller-forks (ro'ler-forks), n. pi. In a printing- 
press, slotted or forked supports, of the nature 
of uncapped journal-boxes, in which the jour- 
nals of the composition rollers are fitted, and 
in which they turn. 
roller-gin (ro'ler-jin), H. A machine for sepa- 
rating cotton-seeds from cotton-fiber, in the 
best form of which the separation is effected 
by leather rollers acting in conjunction with a 
knife or knives. The rollers are set at a distance from 
each other too narrow for the passage of the seeds, while 
the fiber is forced in and carried through between the 
rollers. The knife is blunt-edged, and sometimes has a 
longitudinal motion, its action assisting the separation of 
the seeds, which drop down behind the rollers while the 
detached fiber passes through. Such gins are slower in 
action than saw-gins, but they injure the fiber less. Com- 
pare m'&i, (i. 
roller-grip (ro'ler-grip), . A device for clutch- 
ing a traveling-rope, used as a means of trac- 
tion for railroad-cars. It consists of a set of bind- 
ing-rollers or -wheels controlled by special mechanism so 
as to grasp or let loose the traveling-rope or -cable at will. 
roller-lift (ro'ler-lift), n. In some printing- 
machines, a small cam which raises the ink- 
distributing roller from the surface of the ink- 
ing-plate. 
roller-mill (ro'ler-mil), H. 1. Any form of mill 
for the coarse grinding of grain for feed. 
Specifically 2. A mill in which wheat is 
made into flour by a cracking process, passing 
between sets of rollers arranged consecutively 
at fixed distances apart. 3. A machine for 
bruising flaxseed before grinding under edge- 
stones and pressing. E. H. Knight. 
roller-mold (ro'ler-mold), n. In printing, a 
metallic mold into which, in the casting of 
composition rollers, the melted composition is 
poured. 
roller-skate (ro'ler-skat), n. A skate mounted 
on small wheels or rollers, instead of the usual 
iron or steel runner, and used for skating upon 
asphalt or some other smooth surface. Also 
called parlor-skate. 
roller-Stock (ro'ler-stok), n. The cylindrical 
rod of iron, sometimes covered with wood, 
which serves as the axis of a printers roller, 
and gives it its needed stiffness. 
roller-stop (ro'lr-stop), n. An apparatus for 
arresting or limiting the motion of the ductor 
inking-roller on a printing-machine. 
roller-towel (ro'ler-tou"el), . An endless 
towel arranged to roll over a cylinder of wood 
bracketed to the wall, so that all parts of it may 
be conveniently used. Also called jack-towel 
and roller. 
Eolle's plane. In anat., the plane passing 
through the alveolar and the two auricular 
points. 
rolley (ro'li), . [Prob. < roll + dim. -ey.] A 
kind of truck drawn by a horse, used in coal- 
mines for carrying tubs or corfs along under- 
ground ways. [North. Eng.J 
rolley-polley, . See roly-poly. 
rolleyway (ro'li-wa), . Any underground 
road along which rolleys are conveyed. [Prov. 
Eng.] 
rollichie (rol'i-chi), n. [Also rvlUcMe; < D. 
rolletje, "a truckle " (Sewel), sheave of a pulley, 
lit. 'little roll,' dim. of MD. rolle, D. rol, a roll: 
see roll, .] Chopped meat stuffed into small 
bags of tripe, which are then cut into slices 
and fried: an old and favorite dish among the 
Dutcli in New York. Bartlett. 
They [the burghers of New Amsterdam] ate their supaen 
and rollichfg of an evening, smoked their pipes in the 
chimney-nook, and upon the Lord's Day waddled their 
wonted way to the Gereformeerde Kerche. 
E. L. Bynner, Begum's Daughter, i. 
rollick (rol'ik), v. i. [Perhaps < roll + dim. 
-ii'k, equiv. to -ocAr.] To move in a careless, 
swaggering manner, with a frolicsome air; 
swagger; be jovial in behavior. 
He described his friends as rollicking blades, evidently 
mistaking himself for one of their set. 
T. Hook, Jack Brag. (Latham.) 
There was something desperately amusing to him in the 
thought that he had not even money enough to pay the 
cabman, or provide for a repast. He rollicked in his pres- 
ent poverty. G. Meredith, Rhoda Fleming, xxix. 
rolling (ro'ling), H. [< ME. rollynge; verbal n. 
of roll, .] 1. A reciprocating rotary motion 
about a fore-and-aft axis, more or less irregu- 
lar, as of a ship at sea. 2. (a) Ornamenting, 
by means of a bookbinders' roll, the edges or 
inner covers of a full-bound book, (b) Smooth- 
ing or polishing paper by means of calendering 
rollers. 3. A method of taking trout. When 
5215 
the streams are at their lowest stage in summer, a dam 
of logs, stones, and brush is roughly built at the lower 
end of some pool in which the flsh have congregated. This 
rolling-dam being constructed, the stream for some dis- 
tance above the pool is beaten with poles, and the fish 
are driven down to the deepest water, out of which they 
are swept with a net. (New Brunswick.] 
4. Same as roll, 5. 5. A twist or partial knot 
by which the thread is secured to the bobbin in 
lace-making. Diet, of Needlework Friction of 
rolling. See friction Instantaneous center of roll- 
ing. SeeceJiteri. 
rolling (ro'ling), p. a. 1 . Moving on wheels, or 
as if on wheels. 
He next essays to walk, but, downward pressed, 
On four feet imitates his brother beast : 
By slow degrees he gathers from the ground 
His legs, and to the rolling chair is bound. 
Dryden, tr. of Ovid's Metamorph., xv. 340. 
2. Making a continuous noise resembling the 
roll of a drum: as, a rolling fire of musketry. 
3. Wavy; undulating; rising and falling in 
gentle slopes. 
The country was what was termed rolling, from some 
fancied resemblance to the surface of the ocean when it 
is just undulating with a long "ground-swell." 
Cooper, Oak Openings, i. 
4. Turned over or down with the effect of a 
roll, or that may be so turned down. 
Solemn old Thoresby records how he and his cousin 
" bought each a pair of black silk rolling stockings in West- 
minster Hall." 
Quoted in Ashton's Social Life in Reign of Queen Anne, 
[I. 153. 
A black and red velvet tartan [waistcoat] with white 
stripes and a rolling collar. Thackeray, Vanity Fair, lix. 
Rolling bridge, a drawbridge or a ferry bridge which 
rolls upon wheels ; or a swing bridge supported upon 
balls moving in a circular path. Rolling-cam press. 
See pressl. Rolling circle of a paddle-wheel, the circle 
described by a point in the paddle-wheel which moves 
with the speed with which the vessel passes through the 
water. If the vessel were traveling upon land upon 
wheels of the size of this circle and with the same speed of 
engine, her velocity would remain unaffected. Rolling 
colter. See colter. Rolling curve, a roulette. Roll- 
Ing fire. See fire, 13. Rolling friction. See friction. 
Rolling globe, a large ball on which acrobats stand 
and ascend inclined planes. Rolling hitch, ahitch made 
with the end of one rope round another rope under ten- 
sion, or round a spar, in such a way that when drawn on in 
the direction of the length of the rope or spar the hitch 
will jam. Rolling pendulum, a pendulum carrying cy- 
lindrical bearings which roll upon a plane or other surface. 
A special case of a rolling pendulum is a cylinder loaded at 
one side ; another and extreme case is a pendulum turning 
on knife-edges. Rolling-pressure press. See pressi . 
Rolling purchase, an arrangement of pulleys with one 
or more movable blocks: a phrase having application es- 
pecially to the mechanical appliance used for bending the 
great arbalist of the fourteenth and fifteenth centuries. 
It was an apparatus which could be applied to the stock 
when required, and then detached and carried in the belt. 
See cut under maulinet. Rolling reef, a method of short- 
ening sail by rolling the canvas about a roller underneath 
the yard, thereby doing away with the use of reef-points. 
Rolling resistance, that resistance to the rolling of a 
body over a surface which is caused by cohesion. Roll- 
ing topsail, rolling topgallautsaii, sails reduced in 
area by being rolled up on a roller underneath the yard. 
rolling-barrel (ro'ling-bar"el), n. In gunpotf- 
der-manuf. See barrel. 
rolling-chock (ro'ling-chok), n. Naut., a piece 
of wood fastened to the middle of an upper 
yard, with a piece cut out of its center so that 
it may half encircle the mast, to which it is 
secured by an iron or rope parrel inclosing the 
other half of the mast. Its purpose is to steady 
the yard. 
rolling-cleat (ro'ling-klet), n. Same as rolling- 
chock. 
rolling-dam (ro'ling-dam), n. The rough dam 
used in rolling for trout. See rolling, 3. 
rolling-frame (ro'ling-fram), n. In dyeing, an ar- 
rangement of rollers for drawing cloth through 
the dye-beck. Also called galloper. E. H. 
Knight. 
rolling-machine (ro'liug-ma-shen"), n. Any 
machine which performs its functions essen- 
tially by means of rollers. Specifically (a) A ma- 
chine for making brass fender-moldings and brasswork for 
grates, (b) A machine for smoothing out a cotton-bat and 
working it into fiber like flax ready for carding, (c) A roll- 
ing-mill. 
rolling-mill (ro'ling-mil), w. 1. A metal-work- 
ing establishment using, in connection with 
heating-furnaces, systems of steel rollers for 
forming metal into sheets, bars, rods, or wires. 
Such rolling-mills sometimes bear special names, as a rail- 
mill, wire-rolling mill, etc. The essential feature of a 
rolling-mill is a set or train of steel rollers placed either 
in pairs one over the other, as in a two-high train, or in 
a group of three, as in a three-high train. The heated 
metal direct from the furnaces is presented to these rollers 
and is drawn through between the trains. It is at once 
caught on the other side and repassed between the rollers, 
each passage between them being called a paw. In a two- 
high tr:iiu the rollers are stopped and reversed at each 
pass. In a three-high train the rollers turn constantly in 
one direction, the return pass being between a different 
pair of rollers from the pair first passed through, the mid- 
Rollulus 
die roller, however, always being one of either pair. The 
distance between the rollers is regulated by screws at the 
ends. The section given to the metal in passing through 
the rollers is determined by the shape of the rollers, 
whether flat or grooved, it being possible to produce in 
this way bars having a great variety of sections, adapted 
for independent or structural uses. The rolling-mill serves 
also to some extent to clear the metal passed through it 
from impurities. Small rolling-mills with tapering rollers 
are used to roll short flat metal bars into rings, the pas- 
sage between the rollers expanding the outside more than 
the inside edge, and thus causing the strip to assume a 
curved form. See cut under roll, 2 (a). 
2. One of the trains of rolls with its frame- 
work and driving-mechanism used in rolling 
metal bars, plates, or sheets in a rolling-mill. 
They are also called rolls, and tivo-high and three-high rolls 
according to the number of superimposed rolls in the ma- 
chine. 
3. A rolling-machine for making sheet-glass 
by rolling the hot metal. 4. A form of lea- 
ther-rolling machine. 
rolling-pin (ro'ling-pin), n. A cylindrical piece 
of wood, marble, or copper, having a projecting 
handle at each end, with which dough, paste, 
confectioners' sugar, etc., are molded and re- 
duced to a proper thickness. 
rolling-plant (ro'ling-plant), w. Same as roll- 
ing-gtoek. 
rolling-press (ro'ling-pres), . 1. A copper- 
plate-printers' press in which impression is 
made by passing the plate under a rolling cyl- 
inder. 2. A calendering-machine, which con- 
sists of two or more closely geared cylinders of 
smooth surface, used for smoothing and pol- 
ishing the surface of paper. 3. A machine 
with two or more steam-heated iron rollers, 
which removes indentations from printed 
sheets. 
rolling-rope (ro'ling-rop), . Same as rolling- 
tackle. 
rolling-stock (ro'ling-stok), w. In railways, 
the cars, locomotive engines, etc. Also called 
rolling-plant. 
rolling-tackle (ro'ling-tak"l), n. A tackle used 
to steady a yard when the ship rolls heavily. 
It is hooked to the weather-quarter of the yard and to 
a strap around the mast, and hauled taut. Also called 
rolling-rope. 
Rollinia (ro-lin'i-a), n. [NL. (A. St. Hilaire, 
1825), named after Charles Bolliu (1661-1741), 
a French historian, who aided the botanist 
Tournefort in his work the " Institutiones."] 
A genus of trees and shrubs of the order Anona- 
ceee, the custard-apple family, and of the tribe 
Xyloniese. It is characterized by its globose corolla with 
six lobes in two series, the three outer concave at the base 
and produced into a thick, laterally flattened dorsal wing, 
the three inner small, sometimes minute or obsolete. It is 
readily distinguished from the next related genus, Anona, 
the custard-apple, by its appendaged petals. There are 
about 20 species, all natives of warmer parts of America. 
They bear either thin or rigid leaves, and flowers in small 
clusters which are either terminal or opposite the leaves. 
The fruit is composed of many sessile berries borne on 
a broad convex receptacle, either separate or more often 
united into one roundish and many-celled fruit. R. mul- 
tiflora and R. longifolia furnish a light tough wood, a kind 
of lancewood. ./?. Sieberi is called sugar-apple in the West 
Indies. 
roll-joint (rol'joint), n. 1. A method of join- 
ing metal sheets by rolling one edge over the 
other and pressing the joining flat. 2. A joint 
made by this method. 
roll-lathe (rol'laTH), H. In macli., a lathe for 
turning off massive rolls for rolling-mills, cal- 
endering-machines, etc. The centers are relieved 
from strain in such lathes by rests which support the 
journals of the rolls during the process. 
roll-molding (rol'mol'ding), H. See roll. 
rollock (rolx>k), H. Same as rowlock. 
roll-top (rol'top), a. Having a rolling top. 
Roll-top desk. Same as cylinder-desk. 
roll-train (rol'tran), H. A rolling-mill train. 
See rolling-mill and train. 
Rollulidae (ro-lu'li-de), n.pl. [NL.,<ollulus 
+ -Map.] The Sollulinx raised to family rank. 
Rollulinse (rol-u-H'ne), w. pi. [NL., < Bollulus 
+ -inse.~\ A subfamily of Perdicida or Tetraoni- 
(Ife, represented by the genus Bollulus. Bona- 
parte, 1850. Also called Crypto nyclt in as. 
rolluline (rol'u-lin), o. Of or pertaining to the 
Bolhilinse. 
Rollulus (rol'u-lus), w. [NL. (Bonnaterre, 
1790), < ronlroiil, native name.] A genus of 
gallinaceous birds, type of the subfamily Rol- 
liilinx, having the hind claw rudimentary; the 
roulrouls or wood-quail. The species inhabit Java, 
Sumatra, Borneo, Malacca, and Tenasserim. The red- 
crested wood-quail is R. cristatwt or rovlrmd, of a rich green 
color, with a long red crest ; it lives in the woods in small 
flocks from the sea-level to a height of 4,000 feet. The fe- 
male is lighter-colored, and lacks the red crest. Another 
roulroul is R. niger, sometimes generically separated as 
Mdanoperdix (Jerdon, 1864). The genus is also called Cryp- 
tonyx and Liponyx. See cut on following page. 
