nob when attached as tically, so as not to be in the way of raising or lowering either For at least seven months in the year, in this latitude, an sash, and is retained in position by the action of the spring. shown in the engraving. To secure the device in place, a artificial temperature, high… … it is being done. Under the conditions of winter ventila- the upper rail of the lower sash is a spring clamp or catch, tion, this can only be.accomplished by a constant process of rubber strap passes around the shank of the door knob and D. This has a recess which, when the tongue, B, is turned…
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