164 8

INDEX.

Page

Obelisks, Pantheon -

40

-, Pincio , Monte

40

-, Sallustiano della

Trinita -

-

40

-, Vatican -

-

39

-, Whitaw Esk-

dale

-

1013

Ocha, quarries at

-

100

Ochre, red

-

103

Octaves, boats -

-

137

Oetaedron

-

889

-, to construct

-

778

Octastyle proportions

1582

Oil gas -

-

1242

Olive, wood of

101.

1288

Onctuarium

-

121

Oolite

627. 701

—■ Bath

_

628

——, inferior -

623

, 629

- —, middle -

-

628

-, Portland

.

627

Optical square

-

843

Opus incertum -

-

98

-, reticulatum

98.

1420

Orchomenos

-

79

Ordinates

-

735

Organic remains

-

620

Ostia , Basilica at

-

100

Ovals

749. 876

- . , to reduce to a

circle - - 88

Oxygen - 644

Pacey, Whin - - 348

Paddles - 188. 218. 1550Paeonius - - -75

Paddle wheels, Ro-man - 205

Painters’ work, piecesof 910

Palaeozoic in geology 623Palaestra - - - 130

Palladio - - - 211

Palling the capstan - 206

Palm - 101

Pantheon, roof of * 1832

-, portico of - 1591

Pantograph - - 991

Paoli, Pietro - - 206

Parabola - 750. 758

Paraboloid - - 757

Parallel lines - - 735

Parallelogram - 760. 880

- - of forces - - 919

Parallelepipedon - 888

Parian marble - 99

Parthenon , propor-tions of 1584

Partitions, framed - 1310Pavements, Roman 101,102Pedal - - - 981

Pelasgi - - 68

Pen, geometric - 990

Penara, gates of - 76

Pendentives of vaults 1466Pendulum * - - 981

Page

Penstock, ancient - 194

Pentadoron - - 708

Pentagon 743. 879. 886Pentaspastos - - 200

Pentelican marble - 99

Pentrougn - - 1150

Pephasmenos - ^ 75

Pepperino stone - 95

Perea, Carli - - 206

Perelli, Tommaso - 206Perronet, Jean Ro-dolphe - 266

Perspective - - 789

-, isometrical - 791

Perugia , gate of - 90

Perry, Captain John 398Pertuis or sluices - 188

Phalasarina, city of - 51

Phalerum - - 43

Pharos - - 133. 146

Philopater , ship of - 137

Phosphorus - - 648

Phrygian marble - 100

Piers of bridges - 1506— — of cathedrals,

their form - - 1624

Piers - 132. 314. 320. 397,398. 434. 557

Pile-driving 327, 328. 423.

465. 967. 1070

-, drawing - - 1078

-, cutting off - 1080

Pilae, or moles - - 140

Pile worm, (Teredo

navalis ) - - 1291

Pinchbeck - - 671

Pincian gate - 87

Pine, yellow, 101. 729. 1286Pinning in carpentry 1304

Piombino, Stephano del 163

Pipes of earthenware,

&e. 167

• stone - - 1427

■ for baths - 123

Piquets - - 805, 806

Pisa Cathedral - 1012

-baptistery - 1618

Piscina, remains of - 63

-limaria, &c. - 168

-mirabile - 142

Pis£, manner of build-ing - 725

Pistons, their con-struction • - - 1258

-, strength of - 1257

varieties of - 1259

Pit cranes - - 1006

Pitch tree - - 101

-, manner of mak-ing - - 729

-, lines of wheels 941

• - , prices of pitch-

ing - 911

Pitot’s centres - - 1406

Placoidans - - 621

Plane, epicycloid - 940

Plane table

Page

835

-to measure with

836

-to map with

840

Planeometry

733

Planing, machine forPlanking and piling,

1039

value of

899

Plans, to draw 737

864

-, to copy •

870

-, ichnographic -

760

-, orthographic -

760

-, scenographic -

761

Plants, fossil

Plaster, machine for

622

beating

968

Plate glass

Platform of timber for

731

sluices >

219

-of locks -

1542

Platinum

658

Platonic bodies

889

Pliocene in geology

624

Plungers of wood

1180

Polkilitic formation

629

Points of support

118

-, varieties of

733

Poleni, Giovanni

208

Poleri, Giovanni

206

Poliphele, arch of -

1595

Polygons 743,744.755. 879

Polyhedrons

754

Polyspaston

201

Pomserium

85

Pontoons - 231.1054

Pontqu Gephura

66

Ponts et Chausse^s -

215

Poplar wood - 100.

1288

Porosity -Porcelain, grinding

915

for -

975

Portes busquees

Ports and harbours —

218

Aberconway

360

Aberdeen -

343

Aberystwith

362

Adria

138

Agrigentum

60

Alexandria

32

Ancona

145

Androssan

367

Antium

145

Arbroath -

342

Aubin’s, St.

402

Avoch

350

Axmouth

385

Ayr

358

Baiae

139

Baltimore

294

Banff

350

Bangor

360

Barnstaple

Barton on Hum-

363

ber

324

BeaumarisBerwick cm

360

Tweed -

337