The daily morning journal and courier., 1895-06-21

is brought to 1t by large copper wires
 which are good conductors. Within
 the lamp and forming a part of the cir
 cult is a small film of carbon, made in
 the Edison lamp from a thread of bam-
 boo bent into a loop and carbonized by
 heating in an oven until all the gases of
 the wood are expelled This carbon fil-
 ament Is a poor conductor, and if now
 we pass the current through it we see,
 as already explained, the resistance
 changes the current into such intense
 heat as to produce light. In the Arc
 lamp system used in Illuminating our streets the lamp consists essentially of
 two sticks or rods of carbon placed end
 to end with their fronts slightly sepa-
 rated, through which passes a powerful
 electrical current. The current in or
 der to pass through the circuit must pass through the air intervening be- tween the posts. This air offers great resistance to the current, which causes
 the extremities of the carbon to become intensely heated and give out power- ful light Thus we see that in both the
 incandescent and Arc systems of elec-
 tric lighting the light is produced by
 heating to incandescence particles of | carbon-solid matter.
 This completes the lesson which at the outset we sought to present.
 Before concluding, however, we de- sire just to mention proposed new system of electric lighting in which not a solid, but a gas is heated to incandes- cence. It has long been known that when an electric current passes through a rarified gas the gas becomes | luminous.
 | have here Q tube known as quisler | tube which contains a rarified gas. Just penetrating the glass at each end, but extending only a slight distance within lis small piece of platinum wire Con- necting these wires to an electric gene rator a current passes though the ari- fled gas and as you see, it becomes brilliantly luminous. Rarified gases | then as we'll as solids can be rendered incandescent by an electric current.
 Recent experiments, the credit for which are mainly due to that rising electrical genius, Nicola Tesla have shown that when alternating currents of high frequency and high potential are employed in connection with vacuum tubes, such as these, which contain only rarified air or some other gas, very sur prising results may be obtained. By the use of such currents Tesla has found 1t possible to render the interior of vacuum tubes brilliantly incandes- cent even when no wires are attached to the tube.
 Thus holding in one hand an ordinary ineandescent lamp from which the air has been exhausted, if the other hand be brought in contact with wire con taining these alternating currents the lamp will be brilliantly lighted
 As a practical application of the dis covery MT. Tesla has proposed a new system of electrical lighting in which it will be possible to light a house with vacuum lamps, to which no wires are attached but which may De carried freely about. Whether or not this sys- tenn will prove of practical value re- mains to be seen. No one can predict the possibilities of the future, or foresee what achievement, once deemed impos- sible, shall be realized.
 Much has already been wrought by the patient student, but Dame Nature has many doors still unlocked and who shall doubt but that to the earnest in vestigator who knocks and knocks and will not go empty away, these also shall be opened.
 The class then sang "The Damascus | Triumphal March" (from Oratorio of "Naaman'D. with solo by Miss Emile Neebe was rendered. Miss Neebe's singing was especially fine and won much praise for her from the audi ence.
 Mir. John Lee Gilson then delivered the farewell address, which was as is | given below. His efforts were much | appreciated by the audience and by | the members of the class, whose vale | dictorian he was.
 THE FAREWELL ADDRESS BY
 JOHN L. GILsoN.
 Gentlemen of the Board of Education
 and Honored Superintendent:
 From the time when the little band of l Plymouth colonists built first the church, then the school-house, the peo- pie of.these United States, and of New England especially, have worked for the same principle, knowing well that the better and broader the education of the youth the better and broader will be the citizenship.
 This has nowhere been more keenly | felt and more e'indefatigably labored for than in New Haven. Our city had no, sooner established the grammar schools than she crowned all with the High | school; and when in later times the world began to realize that moral and intellectual training must come early in life, New Haven was one of the first to see this and to make the public Kinder garten a part of her school system Then, being ever alive to the best in- terests of her people she added Man ual Training school And to-day we see our public school system in the van of all that is best and most progressive.
 We who tonight complete the entire course, who have enjoyed to the full these exceptional blessings. find it i'm to express our gratitude to you, gentlemen of the Board of Education, and our esteemed superintendent, who have so zea1ously and ably carried out the wishes of the people of New Haven, giving freely of your time and of your talents; but we hope that in the future we shall, as loyal and patriotic citizens, ae mon and wOmnn Whnsa lives have 1