[Illustration]
This is a novelty in roof ventilation, and possesses the advantage of
admitting light as well as ventilating rooms in the garret or immediately
under the roof.
It can be used on any kind of a slope roof having a pitch of three inches
or more to the foot. The front is of double strength glass which is held
to its place by a single catch. When used as a ventilator the glass is
drawn back to the slant of the roof, and sheds what water would enter the
opening during a rain storm. All the carpenter work necessary in setting
the “Attic” is to saw a square hole through the roof boards at the time
of putting on the roof-covering. We make them to form one plate of our
Broad Rib Roofing with which it interlocks. As shown on page 55, they
can be used equally as well on roofs to be covered with slate or wood
shingles as with our Tin Shingles.