(Similarly, in motor action the electromagnetic forces cause the required position change in appropriate circumstances.) In the system of FIG. 17 there are what might be termed mechanical gates 52, 52A . . . , electro-mechanical gates 52, 52C and coils 54 and 49 in combination, and ...
then low oil prices would seem to be a solution. Unfortunately, the problem we are encountering now is extremely low prices. If prices continue at this low level, or go even