Science Abstracts: Electrical engineering abstracts. Section B, Volume 11

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Institution of Electrical Engineers., 1908 - Electric engineering
 

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Page 503 - ... times the volume of gas ; slightly heavier charges than this could be used, but it is possible that the combustion would not be complete and the pressures in the engine would become dangerously high. The range of mixtures tested therefore covers all which could be practically used. Within that range the efficiency diminishes steadily as the strength of mixture increases, the difference between the weakest and strongest charge amounting to 4£ per cent. in efficiency, or 12 per cent. on the work...
Page 328 - ... coil end leakage depends on the class of winding and the type of the coils, and from what point of view the best results can be obtained. Furthermore, nothing has been published as to how the leakage conditions are arrived at with two-phase and single-phase machines. This treatise has been prepared with the object of developing methods for the calculations of the no-load current and the leakage of three-phase, two-phase and single-phase motors, taking account of all influences as far as possible....
Page 425 - Manchester students' visit to this line the following particulars will not be out of place : — Fig. i shows in plan the extent of the electrified lines, and also gives particulars of the gradients and curves. The line comprises the double roads between Heysham and Morecambe, Morecambe and Lancaster Green Ayre, and the single line from Lancaster Green Ayre to Lancaster Castle Station, the total length of single road being about 21 miles. The power station, which is situated at Heysham, is a gasdriven...
Page 79 - Fixed charges are dealt with entirely above the horiontal line, and operating costs below. The total power cost, at a given loading factor, is then represented by the total vertical distance between the two outer curves. These fixed costs are based upon the following assumptions : (a) Bond interest and taxes 7 per cent. (b) Sinking fund, equivalent to 6.53 per cent, depreciation* 4.2 per cent.
Page 503 - The scavenged charges are dealt with later. The weakest mixture used in these tests contained about 8,65 per cent. of coal gas when in the engine, the proportion of air to gas drawn in Lts.fer sa.
Page 555 - ... collect evidence relating to its cause and to make experiments on the subject. In this task it was soon found that a convenient hypothesis is that all corrosion is essentially electrolytic. Adopting this view a wide field is open to study, and the subject may be conveniently divided as follows : — 1. Corrosion produced by an external EMF or ordinary electrolysis. 2. Corrosion resulting from the contact of different metals. 3. Ordinary or self-corrosion. 4. Corrosion produced by alternating...
Page 52 - The instrument is especially designed for determining the quality of steam at different points along steam turbines, and it can be used with steam of any degree of wetness and of any temperature and pressure above that in the condenser.
Page 435 - Carbon filament lamps rated at 3.1 watts per horizontal candle-power; clear prismatic reflectors either bowl or concentrating; light ceiling; dark walls; large room; lamps pendant; height from 8 to 15 feet.
Page 79 - In this summary, the building cost is naturally high, owing to the large amount of structural material necessary. On the other hand, boiler and condenser costs are extremely low for reasons previously set forth. Using as a basis the above costs and the rate of variation with loading factor already shown in curve form, Fig.
Page 216 - BHP for 80 per cent alcohol is approximately 17.5 per cent greater than for the denatured alcohol used or for gasoline. A series of tests made with alcohol of various percentages by volume, ranging from 94 per cent to 50 per cent, showed that the minimum consumption values in gallons per hour per BHP increased a little more rapidly than the alcohol decreased in percentage of pure alcohol.

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