This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
Piping to be wrought-iron; fittings, of galvanized malleable iron, set with red lead, firmly fastened. Make sure that pipe is free from obstructions, before placing in position. Gas-fitters' cement not to be used.
Longest run in feet
Size, pipe, inches
Number of burners
Piping to be tight under pressure of air equal to column of mercury 6 inches high. Mercury to stand without failing for half an hour. Outlet caps to be loosened to show that they affect testing apparatus, and that there is no obstruction in pipes.
FRONT AND REAR VIEWS OF RESIDENCE AT CLEVELAND, OHIO
Frost & Granger, Architects, Chicago, Ill.