Air, Light and Efficiency Showing Influence of Sash Types and Building Design . themonitor. The wide opening ofthe sash is obtained bythe use of Pond Operat-ing Device, described onpages 42 to 44. Thisdevice, from its low fric-tion and graduatedthrust against the sash,will open the latter widerwith less applied forcethan anv other de\ice. The control of ven-tilating outlets and inletsof large area, such aslong lines of sash in foundries and large fac-tories, or groups of sawtooth sash like those of Goodrich BuildingNo. 40 (pages 11 to 16) is accomplished by balancing the weightof the sash, and
Air, Light and Efficiency Showing Influence of Sash Types and Building Design . themonitor. The wide opening ofthe sash is obtained bythe use of Pond Operat-ing Device, described onpages 42 to 44. Thisdevice, from its low fric-tion and graduatedthrust against the sash,will open the latter widerwith less applied forcethan anv other de\ice. The control of ven-tilating outlets and inletsof large area, such aslong lines of sash in foundries and large fac-tories, or groups of sawtooth sash like those of Goodrich BuildingNo. 40 (pages 11 to 16) is accomplished by balancing the weightof the sash, and by electric motors. In this manner lines or 40 See the storm panels at end of sash, pages 28 and 2g. DAVID L U P T O X S SONS COMPANY groups of indefinite extent may be controlled by a single motor,and the ventilation regulated to any degree desired. Pond Continuous Sash ismade of one-piece rolledsections, much heavier thanused for ordinary sash,which are rigidly oxy-acety-lene welded into units ofsuitable length. These unitsare connected by weatherproof expansion caps into.
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