NAK

230

N AU

35. i =

36. e ==

37. e =

361 t + 140 e3 x 77 = 231'

11389 t + 952 e

34 X 77 = 26181627t + 136e

by 32, 34.

, by 29, 34, 35.

, by 36.

34 X 11 = 374

38. e = m t, by 37.

39. g = '.]§ t, by 7, 38.

40. Q = BJt , by 15,39.

41. it = ®t, by 34, 38.

42. i. = Ml t, by 11, 41.

43. i) — \Fli t, by 4, 42.

44. b = ’S t, by 27, 38,41.

45. a,= Ht, by 1, 44.

46. c = t, by 3, 45.

47. f = Ulp t, by 6 , 39, 46.

48. H = |V 8 S t by 8, 43, 45.

49". i = ®Jt, by 32, 38, 41.

50. p — Ml T, by 14, 49.

51. m = Jil t, by 12, 50.

52. n = 551 t, by 13, 42, 51.

53. r = t, by 16, 40, 50.

“ That is, in Alphabetical Order.

A — 8 ||| T.

B = 8 & T.

C = 9 $8 T.

D = 4 Ml T.

E = 6 m T.

F = 8 Ml T.

g = 7 5 ||t.H = 7 T.

i =5 HIT.

K = 6 ||j T.

L “ 3 T.M = 2 s % T.n = 3 MS T.

P=3H T.

Q = 4 4°s T.K = 4 ,% T.

I I

“It appears, from this calculation, that the greatest of the

217

separate weights will be a = 8 ^33 T " When therefore upon

this point (c C in the middle of the wood) there lie two a’s196 , .

(on both sides) it is 17 ; and so on, in like manner, lest

any rafter give way by its own weight. Whence one-halfthe weight of the timber is determined. The strengthrequisite there, is the same, lest that beam give way,which is equal to the weight of the respective beams917 917 1 77 11

8 _ + 8 — +- = 18-^- = 18—. But indeed this238 T 231 2 238 34

weight is not so great as to occasion any apprehension forthe strength of the timber ; for even if the timbers be prettylong, they are sufficient to bear any weight that may be laidupon them, to eighteen or even to nineteen times their ownweight.

“ Here the weight is indeed heavier than in the precedingcase; for there, the pressure amounted only to fourteen timesthe weight of the timber.

“ In the mean time, the conditions of this constructiondispense with a multiplicity of rafters, as the length of thearea within the walls extends to twelve times the length ofthe whole, the length and breadth of the rafters remaining.For in this case the rafters being joined are equal to 49, butin the other the longer are 40 and the shorter 20.”

Naked of a Column, or Pilaster , the surface of theshaft or trunk, when the mouldings are supposed to project.

of :

Thus we say, a pilaster ought to exceed the nakedwall by so many inches, and that the foliages 01 " rought to answer to the naked of the columns. . . u re9

Naked of a Wall, the remote face whence the P r0 .1 ^ t ]ietake their rise. It is generally a plain surface, and wplan is circular, the naked is the surface of a cyhn“ e ’its axis perpendicular to the horizon. \ the

NAOS or Nave (from the Greek race, a l em P o|-t ofchamber or enclosed apartment of a temple. 11 *® ,‘^vve el 'the temple which stood before the naos, comprehended j]jethe wall and the columns of the portico, was ca jj e( ]tli 6pronaos ; while the corresponding part behind was ca

teoflW

posticum.

NAPIER'S BONES, or RODS, a contrivance "\j' v j s io ,1 >to facilitate the performance of multiplication and jgx7- :explained by him, in his Rabdologia, published 1,1 ^ pt jThe invention would perhaps have been more empl°). jgb®for his discovery of logarithms : but even yet >t I

used with advantage by young arithmeticians in ver i

of their work.

horn,

rj'Uere

These rods may be made of bone, ivory,pasteboard, or any other convenient material, a*— a $ilive of them, and the face of each is divided ito m aeparts, each being subdivided by a diagonal H ne 1triangles. In these compartments or squares the ”S>.the multiplication table are inserted, the units 01 ' ®j jefigures being placed in the right hand triangle, andin the left. tl> e

ile{It®

NARTHEX, the name of an enclosed s P ace

ancient Christian churches, and also of an

ante

in

.te>>iP“

To

the Nartl' e3C t , l6 re

or vestibule without the church,catechumens and penitents were admittedappears to have been several such apartment 3church, but nothing certain is known of

etie“

Narthex is frequently used as synonymous with f'portico.

and

,orc 11

the 1

NATTES, a name given to an ornament used inration of surfaces in the architecture of the 1 " ^ D g. ^from its resemblance to the interlaced widths of al ‘ l

NATURAL BEDS, of a stone, the surfaces e n cl! jthe laminae were separated. It is of the utmost con 3the duration of stone walls, that the lamina? shouUperpendicular to the face of the work, and P iU , u i a te5» ‘jhorizon, as the connecting substance of theselaminae, is more friable than the laminae thei» s j thconsequently liable to scale off in large flakes,reduce the work to a state of rapid decay. . . podl

NAYE (from the Saxon naf) in architecture, ^ _ j. t !tCa church ; or the place where the people areing from the rail or baluster of the choir to - ^

The ancient Greeks called the nave pronaos;frequently call it cella. See Naos. . . - oJi ei' s >

'1 he nave of the church belongs to the pans n ^are bound to keep it in repair, &c.

NAUMACIIIA, the representation of a s ® a k 1 “liethe Romans, which was sometimes performed u 1 ^ fU ffiC ^Maximus or amphitheatre, water being introduce^ eg pe<J ia ^to float ships; but more frequently in places liult ' J"for the purpose, which were called Naumac ^ rep r<f i 11 |t0Caesar appears to have been the first who g :iv ’ 0 j a g » Ygtation of a sea-fight on an extensive scale. _. v evc r ’

which,

of

sente® } »

to the o^tiu*

in the Campus Martius for the purpose,

filled up in his life-time. Augustus also dug a ^ r( j s (Ul t \,eTiber for the same purpose, which was attei' , fi jn 4

d 0 ?

into a park or plantation. Another lake i vas j^frite^jjCampus Martius by Caligula ; but Chiud'd 9 q'Jjenaumachia on the lake Fucinus, now Cela * 1