Laboratory exercises to accompany Carhart and Chute's First principles of physics . ppedoff will tend to be drawn inward, so that there will be no loss of weight due to the glass. Only a tiny hole is needed to admit the air. Filling the Bulb with Water. — After the bulb has been weighed full of air, heat it with the tip of a blow-pipe flame so as to make a little hole in the glass an inch or so from the base of the lamp. When the heated glass is cool, immerse the bulb upright in the water of a battery jar so as to leave the first air hole made just above the surface of the water (Fig. 26). Whe
Laboratory exercises to accompany Carhart and Chute's First principles of physics . ppedoff will tend to be drawn inward, so that there will be no loss of weight due to the glass. Only a tiny hole is needed to admit the air. Filling the Bulb with Water. — After the bulb has been weighed full of air, heat it with the tip of a blow-pipe flame so as to make a little hole in the glass an inch or so from the base of the lamp. When the heated glass is cool, immerse the bulb upright in the water of a battery jar so as to leave the first air hole made just above the surface of the water (Fig. 26). When the bulb is nearly full, incline the bulb, so that the rest of the space can fill with water. Then take the small square of adhesive plaster and stick over the lower hole, holding it in position for a couple of minutes with the finger. Now cover the upper air hole with the finger and remove the bulb from the water. Holding the bulb nearly upright over a funnel sup-ported in a graduate, pierce through the adhesive plaster just over the lower air hole. When the finger over the. Fig. 26. DENSITY OF AIR 67 upper air hole is removed, the water will run down intothe funnel. Remember that the outward flow may bestopped at any time by closing the upper hole with thefinger. Record the measurements in tabular form near the topof the left-hand page. Observations Weight of incandescent bulb empty .... g. Weight of bulb filled with air g. Volume of air filling bulb Record, if so directed, the temperature of the air in theroom and the barometric pressure. Describe briefly the steps in the experiment and illus-trate with drawings from your apparatus. Place the table of calculated results at the top of theright-hand page. Calculated Results Weight of air filling bulb g. Volume of air filling bidb . Approximate density of air , ^——- Conclusion: The approximate density of air in room at existing con-ditions was grams per cubic centimeter. 68 LABORATORY EXERCISES EXPERIMENT 16 B
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
