## An Encyclopaedia of Architecture, Historical, Theoretical, and Practical |

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Page 271

To find the centre of a

be AGBF . Draw any chord AB ( fig . 267 . ) ; bisect it , and from the point of

division D raise a perpendicular FG : this line will pass through the centre , and ...

To find the centre of a

**circle**. Let the**circle**of which it is required to find the centrebe AGBF . Draw any chord AB ( fig . 267 . ) ; bisect it , and from the point of

division D raise a perpendicular FG : this line will pass through the centre , and ...

Page 292

and 1 ) will be the centre of the

equilateral triangle in a given

( fig . 378 . ) ; from the point B as a centre , with the radius BC of the given

and 1 ) will be the centre of the

**circle**. 1015 . PROB . XIX . To inscribe anequilateral triangle in a given

**circle**. Through the centre C draw any diameter AB( fig . 378 . ) ; from the point B as a centre , with the radius BC of the given

**circle**...Page 331

To find the diameter and circumference of any

1 . As 7 is to 22 , or as 1 is to 3 . 1416 , so is the diameter to the circumference . Or

as 22 is to 7 , so is the circumference to the diameter . Example . Required the ...

To find the diameter and circumference of any

**circle**, either from the other . Rule1 . As 7 is to 22 , or as 1 is to 3 . 1416 , so is the diameter to the circumference . Or

as 22 is to 7 , so is the circumference to the diameter . Example . Required the ...

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angle appears arch architect architecture base beam becomes bricks building built called cathedral centre century church circle colour columns common considered construction contains course covered curve depth describe diameter direction divided draw edifices effect employed equal erected examples experiments extremely face feet figure force four front give given greater half height horizontal houses inches iron Italy joints length less lime material means middle mouldings nearly necessary observed obtained parallel period perpendicular piece placed plane portion practice principal produced Prop proportion quarries radius remains respect Roman roof round says side similar solid square stone strength style supposed surface temple thickness timber tower triangle upper vault vertical walls whereof whole wood