Forty-feet Reflecting Telescope. 373 
was added to its thickness within ; upon this again, an iron 
bar, 6 inches broad, and J- thick, was bent round close to the 
end, from b to h only ; and another bar, 2-f- inches broad, 
and \ thick, made into a complete circle, was added to sup- 
port that end of the tube which had been cut, to make the 
entrance. All these pieces were well secured, by screw-bolts 
passing through the nine long outside bars ab c ghiklm, 
next through the tube, then through the strong sheet, and at 
last through the broad strap and circular bars, upon which 
they were screwed down with nuts at the inside. The more 
advanced parts of the long bars were secured also by screw- 
bolts passing through the tube, and through circular straps of 
hoop iron, about 2^ inches broad, and {■ thick ; one of these 
being put into every sheet of the tube as far as the bars went. 
As we had now secured what I call the point of support, it 
was no less necessary to form a strong point of suspension. 
This was obtained by grasping the tube with a system of bars 
similar to that which has been employed at the bottom. 
Ten bars, equally divided arourid the circumference, about 
10 feet 4 inches long, are placed longitudinally so as to have 
one of them at the top, and an opposite one at the bottom. 
Every one of these has six screw-bolts, which pass through the 
bar and the tube, and also through complete circles of hoop 
iron, which is of the same breadth and thickness as has been 
mentioned before. The bars also, except the highest and 
lowest, 'are of the size of those which have been used about 
the point of support. They are also, like them, chamfered at 
the sides, and begin to lessen in breadth and thickness about 
4 feet from the front, to the same dimensions with the former, 
mdccxcv. 3 C 
