Show t scientific CORNER CURRENT NOTES OP OF DISCOVERY AND INVENTION A ettle X kay apparatus how bow sea satu catch sea gone gon bastes sew new the ciuc M chine GREAT curiosity has haa recently been brought into england from mone along ayr in asla ada the of the chal R dees it is IB an ordinary ordino no white wine vine glass bottle of unmistakably 1 europea an n manufacture finding its way vay to the orient it fell into the hands of ome ingenious asiatic who inscribed upon the interior of the bottle one of the odes odea of hafetz how this thiis was accomplished no european has been able to discover not george III puzzling over the problem of how the apple got within the dumpling could have been more dumbfounded kazins nw now steamboat the family herald ha ald some months ago gave an illustration of the proposed steamship to be built by M bazin a french marine engineer wherein the vessel was shown mounted on huge wheels which enable it to roll over the waves the idea lying behind his h is proposition can be shown by an experiment peri ment take a hollow lens shaped disk something like two saucers joined together which can be held vertically in the water plunge this disk into th the e water a and n d pu push 9 it 1 it t fo forward rw a rd you will find that it will go ahead for some feet and will then be stopped by the resistance of the water but if before you push it you give gire it by means of a spindle crossing its center a sufficiently rapid rotary movement you will find that the disk will so BO to speak saw the water instead of cleaving it and will thus make ten umes times the distance the first rolling boat constructed under these conditions will shortly be launched on the seine what spectators will eee in this vessel will be a large platform holding the boilers machinery saloons cabins etc supported on each side by movable hollow wheels the inventor predicts that by these boats a speed of a mile a minute will be obtained a speed sufficient to bring the continents of america ameria and europe within four days ot at each other coal production of the world just how long the black diamonds will last is being continually discussed but even the earliest period set fet down when the coal of the world will be exhausted is too remote to induce the present generation to take much interest in the subject but the annual production of coal is something wonderful the geological survey at washington agton has just issued a bulletin showing the coal production of the world during the last twenty eight years the total output in 1868 1968 was about tons of which the united states yielded 14 per cent it gm gradually dually increased until in the years 1892 93 94 it exceeded tons annually of which on an average the united states contributed 30 per cent and great britain only a little more though formerly the latter used to contribute fully 50 per cent of the total production the produce of was states tons great britain tons toils germany cons france tons A austria atria tria hungary tons belgium tons russia tons other countries 1 tons total tons in n 1895 united states state tons great britain tons germany t tons france ton 11 austria hungary tons belgium 22 tons tons russia other countries tons total tons an xray X ray pay apparatus from the scientific american the expense of special crookes tubes powerful colls coils and batteries has deterred many from entering this interesting field of experiment but mr R mcnell mcneil of this city has recently devised apparatus para in which an ordinary incandescent lamp la is substituted for the grooves crookes tube and an induction coil of common form Is made to supply electricity Z of sufficiently high potential to produce the X ray phenomena the lamp which is a 62 52 volt 16 C candle ower sawyer man lamp Is made of german or lime me glass for convenience bence it is III mounted in art an insulating standard the top of the lamp is covered with aluminum inam foll foil which is ft connected with one terminal of the ary of the induction coil and the hot bot torn tom Is conn connected with the other ter fer menal of the to decou secondary dary as shown the amy X say proceeds from the cathode by means ean of the 11 the shadows of ajie the bones of the me hands and feet the um mar be seen when th eyare placed between th the era i V that a blue fog appears in the lamanac vacuum is too low for the be s t ts by placing the lamp la in awe circuit tor for fifteen or thirty minutes the high vacuum Is 1 restored by the heat and will wih remain good tor for about fifteen minutes the coll coil Is capable of giving a three inch spark and the X ray my produced by this simple and inexpensive appa apparatus ralus Is sufficient tor for making radiographs radiography radio graphs now how sl seals catch sea SG aults aUB the sea lion ilon Is probably the clumsiest animal in the world he likes to bask in the sun all day and when he moves he Is exceedingly sluggish and awkward it has often been wondered ho how w this animal manages to secure its favorite food wild aea a fowl sea gulls are an so wild that it Is difficult evert even tor for man to get within gun shot of one the tha seal beal wems to realize that it would be a wate waste of time to attempt to crawl up upon the gulls as they rest upon the water and catch them una unawares waxes S so 0 he watches until the gulls are soaring slowly through the air close to the waves then the seal dives into the sea and swims underneath the water tor for some distance by the time he has managed to swim about a hundred feet the th gull has forgotten the presence of its enemy this gives the seal his opportunity port unity he cautiously rises to the surface of the water at some distance from the point at which he dived and allows merely the tip of his great nose to appear above the water Rem remaining aAning in this position he gives his enormous body a rotary motion so that his nose describes ibes a circle on the surface of the ocean he does this so skillfully that to the gull his nose looks like a water bug at play this thia catches the gulls eye and it at once darts down with the speed of an am arrow aiming straight tor for the little dot the seal sees it coming and sinks a few inches and as the gull strikes the water with tremendous force the seals jaws close upward and the th gull disappears the flying machine it Is an old story now that the aero of the day have abandoned the search tor for light materials and buoyant ga gases ses in attempts on aerial navigation the flimsiness and large area of exposure that attend the use of such means place the aeronaut at the mercy of the elements their hope now lies in the princ principle aiple of the oyster shell which boys sail to such gratifying distances and comparatively small email muscular effot effo t and the laws which account for soaring birds like the buzzards prof langley mr maxim max in and herr lilienthal lillienthal are one in reliance on this aeroplane theary the mechanical peculiarity of the aero planes motion is similar to the gliding of a rapid skater over thin 10 is the taster faster he goes the less danger is there here of sinking so prof langley has used in the building successful machine substances aetta actually lly a thousand times heavier than th taft air which promised to support them and he relies entirely on the extensive area of the planes shaped something like the th wings of a hawk and their nalo to the currents cur of air to achieve buoy anoy ancy the oyster shell analogy veordo barrt Bo rrt luminous explanation to every man who remembers bers the ecstasy of seeing the white disc soar away and up olig long after the ea earth rth should by all experiences of stone throwing have her own the me flatter and the be shell within the limits of weight the more astonishing the flight that ed unless indeed the edge of thir th laj icila site sile were inclined downward inseal in teAl of slightly upward in the former ube the shell darted instantly to eath and ake throw tell fell so much short of the average heaving of a pebble as the themore scientific skim would have exceeded it |