Show A novel no but tout simple device for ventilating ventilating Ill ing car cars cam factories and houses has hns 1 Just lust been devised by 11 JJ T T. In a R. panel of or glass laN or sheet hect metal natal a large e number of or I bosses are aro stamped each boss being perforated perforated per per- forat d h by a n holo about a quarter of or aninch nn an inch in diameter Tim lh panel is mounted in a wall or window and if IC Iho tho bosses I project outward tho wind Ind causes a distinct distinct dis dis- ls- ls current of or sir air outward through the tho holes but If it the panel I ls is r reversed th time tho current pas passes es inward Inwald at d. d The action Is la still tho the same whether tho wind blows directly A against tho the p panel nel or across It H. |