SPIRE ON A NEVr CONSTRUCTION. 245 



B B, fig. 6, 20 feet long, placed obliquely fiom the bottom 

 of one bar to the opposite bar, to which they are connected 

 by screw bo'its, thus forming angular braces. 



The spindle of the weathercock rises 5 feet above the apex Spindle, 

 of the spire, and, passing downward through thejunction 

 of the bars, it is inserted into a solid diaphragm under and 

 against which it is keyed by a forelock. 



Beside this diaphragm, and that which forms the base of Diaphragms, 

 the spire, there ate three others D D D, fig. 6, of a con- 

 struction similar to that of the lowest diaphragm, placed at 

 equal distances from each other. It is to be observed, that 

 the cheeks or ends of the three upper diaphragms project 

 beyond the upright legs of the spire, to assist in supporting 

 the slates; but the cheeks of the lower diaphragm take in 

 not more than two inches of the feet of the bars of the spire; 

 which feet, as may be seen at fig. 4, are considerably broader 

 than the rest of the bars. 



At B, fig. 4, a tenon is formed at the heel of the foot of Feet of th«; 

 each bar, whi{;h is to receive a key, or forelock, to fasten the ^^^* 

 spire to the tower, after it has been raised to its place. 



To raise and guide this spire, a pedestal, the plan and Carriage for 

 section of which are seen at fig. 2, and 6, was constructed, raising the 

 It consists of a top and base, each formed of four pieces of 

 deal 6 inches square, and of eight jambs, or uprights, of the 

 same breadth and thickness, and 10 feet high, morticed into 

 the base and top, »o as to stand nearly under the eight legs 

 of the spire when it is raised upon it. See fig. 6, where 

 J: J J show the position of these uprights. The uprights 

 are strengthened, by braces, o b b o, so as to prevent them 

 from racking, or moving obliquely. The pedestal was fur- 

 nished with eight wheels 6 inches in diameter, at its upper 

 corners; and xvith eight similar wheels at its lower corners; 

 as in the plan, fig. 2, and in the section, fig. 6, to w. 



To facilitate and guide the movement of this pedestal up- 

 wards, the tower was lined at each corner with thin planks, 

 P P, fig, 1, fastened to the walls perpendicularly, and ad- 

 justed with care. Against these planks the wheels of the pe- 

 destal moved upwards with little friction, keeping the spire 

 perpendicular in its ascent, 



R 2 Wh«|i 



