Civil And Mechanical Engi Neer's Society.

the Moorfield Spinning Company ( Limited ) fell with a terrible crash on Thursday , 3 rd August , 1870 . The height was about 6 G yards , and it was only ou Tuesday , that a flag was hoisted at the top to signify that the bricksetters had completed their work . No one was injured , but the damage clone

will not be far short of £ 3 , 000 . In 1872 the chiinney at a cotton mill in America was moved bodily a distance of 20 ft ., to allow the enlargement of the mill . It is 70 ft . high and nearly 8 ft . square at the base , and it was slid along planed and greased planks by means of 2 Jack-screws , and the flues connected and fires started

in 8 $ hours . The St . Rollox Chimney , Glasgow , is 455 ft . 6 ins . from bottom of foundation , and 435 ft . Gins , from ground line . At Messrs . Dobson and Barlow , Machine Works , Bolton , there is a Chimney 367 ft . 6 in . high from ground level . In Nottinghamshire at Carlton , there is one 173 ft . high , and at Lenton another 153 ft . from ground to summit .

'MIE HIGHEST CHIMNEY IN THE WORLD Is the well-known " Townsend Chiinney , " Port Dundas , Glasgow , its total hei ght from foundation to top of coping being 46 Sft ., and from ground level to summit 454 ft . The history of its construction aud of its threatened failure when nearl y completed , will therefore be of great interest to all those who have made

chimney-shafts or stalks their study , and indeed , to architects and engineers in general . The chimney was designed and built by Mr . Robert Corbett , Bellfield Terrace , Duke Street , Glasgow for Mr . Joseph Townsend , Crawford Street Chemical WorksPort Dundas .

, No piles were used in the foundation , which is built on " blue till " or clay , which is as solid and compact as rock . The foundation consists of thirty courses of brick on edge , the lowest course being 47 ft ., and the topmost course 32 ft . in diameter .

This foundation was commenced on July 30 th , 1857 , and finished on August 20 th of the same year . The erection of the shaft was continued until November llth , 1857 , ( excepting from September 3 rd , to October Sth , during this period operations were suspended ) . This closed the first season . The second season commenced on July

10 th . 1858 , and closed on October 16 th oi the same year , the stalk at the latter date being 228 ft . in height ; the third and last season commenced on July 3 rd , 1859 , and the coping was laid on October 6 th of the same year , but work was suspended from September loth to October othin

con-, sequence of the chimney swaying . Durin » this interval it was restored by twelve cuttings with saws on the opposite side to the inclination , as detailed hereafter . The inside lining or cone is of 9 in . fire-brick and about 60 ft . in hei ght , built distinct

from the chimney proper , with air space between , and covered on top to prevent dust falling in , but built with open work in the upper four courses so as to allow of the air passin g into the chiinney . The size of the bricks used in the con - struction of this chimney was lOin . x 4 iu . + oiin ., and the number used was as follows : —

Common bricks in chimney 1 , 142 , 532 Composition & firebricks in cone 157 , 408 Total 1 , 300 , 000 The bricklayers' time was : — In 1857316 clays of 10 hours each

, . 1858 , 431 X „ „ „ „ „ 1859 , 423 i- „ „ „ „ „ giving a total ot 1 , 171 days ' time occupied in building the chimney , which gives on an average 1 , 110 bricks built per day of ten hours by each bricklayer .

Besides the above number of bricks used in the chimney , there were also 100 , 000 used in constructing flues , & c . The total number ( of bricks laid in chimney and flues , ) was 1 , 400 , 000 , the weight of which at 5 tons per thousand is 7 , 000 tons .

Iron hoops were built in at a distance from the surface of 9 in . at the bottom , and 4 Jin . from the top , and at intervals of ' 25 ft . in height . The thickness of the wall of the chimney varied as follows , commencing of course at the ground level .

1 st section 30 ft . in hei ght 5 ft . 7 in . thick 2 nd „ 30 „ „ 5 „ 2 „ 3 rd „ 30 „ „ 4 „ 10 „ ^ th „ 40 „ „ 4 „ 5 „ 5 th „ 40 „ „ 4 „ 0 „ 6 th „ 40 „ „ 3 „ 7 „ 7 th „ 40 „ „ 3 „ 2 ,