School physics; a new text-book for high schools and academies

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...e; do not let it touch the brass tube. Place a tumbler below the exit tube at i. Connect the inlet tube at a, by a piece of rubber tubing 75 or 80 cm. long, to the boiler described in Exercise 3, page 275, and shield the adjusted apparatus from the heat of the lamp and boiler. Then measure the horizontal distance from the center of the fulcrum screw to the edge of the millimeter scale from which readings are to be taken, and the vertical distance from the center of the same screw to the steel wire at the end of the brass tube, and find the ratio between the two distances. This ratio should be not less than 20. Note the reading of the scale and the temperature inside the jacket. Generate steam in the boiler and let it flow through the jacket for a few minutes after the mercury has ceased to rise in the thermometer. When the movement of the long arm of the lever ceases, take the readings of the millimeter scale, the thermometer, and the barometer. Test the accuracy of the thermometric reading by the temperature as computed from the boiling-point of water at the observed atmospheric pressure. Detach the rubber tube at a and allow the apparatus to cool. Press the brass Represent the actual elongation of the bar by e; the temperature observed at the beginning of the experiment by (; the highest temperature by t'; the length of the brass tube before heating by I; and the coefficient of linear expansion by k. Then we have, by definition:--k =-;whence e = k (t'--t) I. (t'-t)t' K' This last algebraic expression shows why k is called a coefficient. 8. Determine the boiling-point of a saturated solution of saltpeter. 9. Put a little water at the temperature of the laboratory into a nickel-plated cup, the outer surface of which should be brightly polished. Breathe upon...