The Artizan . nd lower sides of panels must be of wrought iron. The roof willbe composed of ten cast iron segments, accurately fitted together and se-cured with wrought iron bolts fin. diameter. All surfaces of contact mustbe planed or faced. The joints must be made quite water-tight. The in-terior of the roof of lantern must be lined with sheet zinc, aVnd of an inchin thickness, secured to the flanges with wrought iron tap screws t^thsof an inch in diameter, and not more than 6in. apart. All the bolts usedfor the lantern must be neatly fitted and finished. The air registerswill be made of cop
The Artizan . nd lower sides of panels must be of wrought iron. The roof willbe composed of ten cast iron segments, accurately fitted together and se-cured with wrought iron bolts fin. diameter. All surfaces of contact mustbe planed or faced. The joints must be made quite water-tight. The in-terior of the roof of lantern must be lined with sheet zinc, aVnd of an inchin thickness, secured to the flanges with wrought iron tap screws t^thsof an inch in diameter, and not more than 6in. apart. All the bolts usedfor the lantern must be neatly fitted and finished. The air registerswill be made of copper and brass; the brass work to be finished bright. The hinges for the windows of watch-room must be made of sheet brass. The pipe for water closet to be of cast iron. Countersunk holes to bedrilled for wood screws where required. The centre sockets and columns for sustaining the second floor and lan-tern deck to be of cast iron ; thev must be so cast as to fit snugly without 35 THE I«tizjk DECEMBER |sT 1861. 270 Practical Papers for Practical Men. TThe Artizan,L Deo. 1,1861. necessitating boring or turning. Holes for bolts must be drilled, whereshown. The sockets for connecting the side frames of house with thesecond floor girder; the angle pieces for securing the frame of the housetogether at the corners, and the sockets for the wooden railings, to be ofcast iron. The holes must be drilled for bolts or screws. The upper corners of house frame for first story will be connectedtogether with straps made of boiler plate. Countersunk holes to bedrilled for wood screws. There will be four wrought iron knees for securing the centre railingposts at lantern. Couutersunk holes for wood screws must be drilled. The water tanks to be made of good plate iron. A rim of half roundiron to be rivetted around the upper end of each. One copper overflowpipe must be provided and fitted, but not permanently secured, to eachtank. A brass cock of one inch bore to be secured to the lower part ofeach
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