The design, construction and test of a direct reading engine indicator (1917)
Tower, Alexander McJunkin, Siegmund, Humphreys Oliver · leaf 18
ds, one making use of the galvanometer, the otherinvolving the oscillograph, were used to test the accuracy of thesliding contact. First, knowing that with a uniform rotationalspeed the contact described a simple harmonic motion over the bridgewire, it was evident that the variation of the current… … Fig. 3. Machine for Testing Sliding Contacts. tial but not in polarity. Let us assume a sine wave relation as shown in Figure 4. Withreference to the zero line, the variation of current is expressedby the equation i = I sin 6 ♦ I (1) Now if the variable and fixed contacts are together no current…
Internal combustion engines · Theses
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