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Show RECENT INVENTIONS. Marine propoller shafts are prevont-pd prevont-pd from corroding, by covering the exposed ex-posed portions with a ooatlna ot load of other pliable metal. Corko aro troatod with beeswax, paraffin para-ffin or othor was and then coated vlth guUa porcha, to replace rubbor stoppers stop-pers for bottles containing adds ox tlulds which evaporate easily, tho cork being cheaper than rubber. Envelopes can bo easily opened by a now dovlco which la formed ot a bau oupportlng two uprlghto with albta In tho stden to euldo n knlto-blado driven down by a knob nt the top to slice a thin strip from tho odge of tho letter. An Improved llfo-saving buoy Is forrned or a Jaoltot to bo buttoned around tho wearor to support two quad-ront-ohaped Inflated. pcok,et8 extending extend-ing from tho sides of tho gannout undor un-dor tho urma, the latter Wolng lott tree. Tho neck of a.non-rcflllablo bot.tlo has a projection from one side of tho top through which the cprk is pushed to tho highest point in Uto neck and then forced down In tho bottlo by a pin placed at the lop, tho "nock being brokon In order to get tho cork pat. To Indlcato tho distance travoled by railway cars a bevel-gear wheel la mounto4 on the cajr oxlo to rnosh with a second wheol and drive a mochaniosi arrangement under the car, deajgnod to run in either nlrectlon and turn a shaft connected with a 60t of dials 'nsldo the car, Pavoments cau bo kept clean, by a new machine which has a receptacle, roouutcd on whoelo with a mouth ox-teudlhg ox-teudlhg down level with the pavement, brushes being arranged over tho'opon-Ing tho'opon-Ing to revolve and tako up the dirt as the sweeper t pushed along by tho handle at the rar. To facilitate the aocoss cf air to the name and prevent the production ot soot, a now acetylene burner ! formed of a curved pipe, which has openings in Ita outer surfaco to throw the flames, further apart as thoy projoct from the burner, the Jots thna forming rays around a seml-clrol. Writing can bo easily taught In school by a new copy book, which tut3 an outer covfcr provided with a rod at tho center ot the back to hold tho leave In place and support a movable copy slip, which slides down as a line Is Written to cover It and keep the pupil pu-pil from looking at It instead of the copy. In order to produce a racing soono cnx-. tkaaur stage an Englishman has denlsfciKi an endless traok, mounted jit rplibru and driven in a dlroctiqn opposite op-posite to the motion ot the anjmals, The roller opfndlos run In oil btbe to prevent holso, and a panorama ereen of scenery la provided, while Iit9 of olr are blown on tha Jockey i |