Small motors, transformers, electromagnets; a practical presentation of design and construction data for small motors, small low- and high-tension transformers, electromagnets, and induction coils (1920)
Stoller, Hugh Montgomery, Austin, F. E. (Frank Eugene), 1873-, Seeger, Edwin Wilbur, 1892- joint author, American Technical Society · Chicago, American Technical Society · leaf 206
quals 2r Circumference of large circle = 27rX2r = 47rrTherefore Sum of circumferences of 4 small circles = 2 circumferences of large circleArea of large circle = ttR^Area of 1 small circle = ttt^Sum of areas of 4 small circles = 4irr^Since R equals 2r and R^ equals 4r2 Area of large circle = ir^r^… … Fig. S4. Relative Areas of Circles that of the large wire, the radiating surface of the four smallwires is twice that of the large one. If nine equal small roundwires have the same conductivity as a single large round one, they 193 50 DESIGN OF SMALL TRANSFORMERS will have three times the radiating…
Electric motors · Electric transformers · Electromagnets · Induction coils
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