| Show A CHEMICAL TRICK how a surer s ng phenomenon can be produced to amuse fr ends when we happen to witness a phenomenon which seems to violate nat ural laws we are not likely to forget its cause if it be explained to us the following experiment will help those interested to understand as well as to remember some chemical data A white cat made of flexible paste board and imprisoned in a glass jar is shown to the audience the lee announces that without opening the jar or even touching it he will cause the cat to undergo a zoological as well as a chemical transformation he takes the support of the jar and pushes it forward in full view ot the students the change occurs almost instantaneously the cat takes a rich orange color on which black transversal stripes rapidly paint themselves the cat has become a tiger the transformation the whole transformation is pro deuced by emanations of hydrogen sul bhide which is generated in the a itself without any visible apparatus the cat has been previously coated with a solution of chloride of anti mony wherever the orange hue was to be produced and with a solution of basic acetate of lead wherever the black stripes were to appear both solutions are colorless after the coated cat has been introduced in his glass cage a small piece of pasteboard is placed under the wooden support so as slightly to incline the jar forward A few deci grammes of pulverized sulphide of iron folded in a piece of blotting paper are depos cited behind the cat on the elevated ide of the bottom of the jar two three cubic centimeters of diluted sulphuric acid are dropped with a pipette on the opposite side when the performer wishes the tran storma alon to take place he takes the wood en support and pushes it forward as it he wanted to enable everybody to see better what Is going to happen by so doing he suppresses the slight inclination which kept the iron aulph ide beyond the reach of the sulphuric acid the gas is evolved and the formation of the orange sulphide ot antimony and black sulphide of lead takes place in a few seconds AN unbreakable how an old buggy spring can be turned to good account an illinois correspondent of lar mechanics sends that publication a simple means of making what he is an unbreakable S wrench here is the way he describes it forge down a piece of old buggy spring as at A then work it on the edge of an anvil to a diamond shae by as at punch a hole in each diamond shaped part a little in front of the center and cut out to edge drive in a punch to spread 0 0 useful S shaped wrench the jaws and bend one each wai sideways and work to shape on the edge of the anvil bend back straight and finish on the hardy leaving jaws with a diamond corner as at this wrench will not break as those made in the usual way D often do I 1 find that old springs make the best wrenches ane cement industry jhc tremendous development of the cement industry in the united states Is revealed by the fact that in ten years beginning in the prodoc tion of portland cement increased from barrels annually to 26 barrels it Is estimated that the output of portland cement during 1906 will aggregate 30 barrels notwithstanding the rapid develop ment of the concrete industry in the united states there Is plenty of ce ment for home needs and enough in addition to supply a growing foreign demand consul harris reports from mannheim that germany s sales of cement to the united states which for upwards 0 a decade amounted to more than a million dollars annually the amount in 1900 having aggregated 2 have dwindled to halt a million dollars new protection for chauffeurs A new speedometer for motorists is now on the market says technical world magazine which not only gives the rate of speed per hour and the number of minutes to the mile but can be set at any given speed so that when that speed Is exceeded a buzzer announces the fact to the driver with this device in use a chauffeur can set the speedometer at the limit of speed allowed in the country where he Is traveling and aa soon as the limit Is exceeded he will be warned of the tact |
