The Internet Archive has a preservation copy of this work in our general collections.
desired, and preventing direct draft on any person, no matter how cold it is or how high the wind is blowing. A hinge, bending outward, is now placed at the point marked (D, Fig. 1 ). When putting the ventilator in position, pressure outward simply snapping it in place, ready for descent of window-sash; pressure inward "breaks" the board for removal.doi:10.1001/jama.1909.02550160047003 fatcat:plcd4eq4kveb3fuyuvg2jnkc2e