insert is higher than the tongueof the track, there is no chance for itto cut the insert. At the meeting-rail a zinc strip isattached to the lowerrail of the upper sashand a spring bronzestrip to the upper railof the lower sashin such a mannerthat, as thesashes are closed,the strips inter-lock,…
Building and engineering specifications · Construction companies · Building material manufacturers
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
