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Updated: May 28, 2025
The stem s is provided with an aluminium tube a, for purposes before explained, and only a small part of the filament reaches out of this tube. By holding the tube T1 anywhere in the electrostatic field the filament is rendered incandescent.
This disposition, besides being convenient, has the advantage that when the coil is well balanced that is, when both of its terminals T1 T1 are connected to bodies or devices of equal capacity there is not much danger of breaking through to the primary, and the insulation between the primary and the secondary need not be thick.
Multiplying this by 425, or Joule's equivalent for the metrical system, the energy developed in heat is given by Dividing T1 by T, we obtain the ratio which the energy developed in heat bears to the total energy of the blow. With regard to the form of the zone of melting, it was found always to extend round the edges of the indent produced in the bar by the blow.
Following this thought, I have carried on experiments in various directions, of which some were indicated in my former paper. I may here mention one or two more lines of experiment which have been followed up. In the tube T was placed a coil C of aluminium wire, the ends of which were provided with small spheres t and t1 of aluminium, and reached into the U tube.
The tails of the terminals T1 T2 must be truncated sufficiently not to penetrate the base and make contact with the barrel, or a "short circuit" will be evident as soon as the battery is connected up.
Generally in bulbs made on this plan the globe L communicated with the tube T. For this purpose the ends of the small tubes t and t1 were just a trifle heated in the burner, merely to hold the wires, but not to interfere with the communication.
If you do not possess any brass strip, the lever may be supported on wooden uprights glued and screwed to the base. Contact M is a small piece of brass attached to the base by a screw at one end and by T1 at the other. K was drilled near the end to take the short coil of insulated wire joining it to T2, and O was similarly connected with T4. The spring, S, should be fairly strong.
"Judas Priest!" said D'ri, as he stopped the light with thumb and finger. "I 'm goin' t' set here 'n th' straw luk an ol' hen 'n' ile up m' thinker 'n' set 'er goin'. One o' them kind hes t' keep 'is mouth shet er he can't never dew ho thinkin'. Bymby, like es not, I 'll hev suthin' t1 say et 'll 'mount t' suthin'." We lay back on the straw in silence.
In this case a tube T is sealed to a globe L. The tube contains a coil C, the ends of which pass through two small glass tubes t and t1, which are sealed to the tube T. Two refractory buttons m and m1 are mounted on lamp filaments which are fastened to the ends of the wires passing through the glass tubes t and t1.
To carry out this idea the inlet valves are furnished with two guides, which, passing upward through the stuffing-box, are attached to a hard steel cross piece, which receives the action of a bent catch turning on a pin attached to the levers, t1, t2, t3, t4.
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