Figure 2.65 shows the Whitworth mechanism. The crank \(O_{1} A\) rotates at \(120 \mathrm{rpm} . O_{1} O_{2}=100 \mathrm{~mm}\), \(O_{1} A=200, O_{2} C=150 \mathrm{~mm}\), and \(C D=500 \mathrm{~mm}\). Locate all the instantaneous centres and find the velocity of ram \(D\).

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35 35 34 at 36 34 at 16 at 46 13 25 26 12 60 24 4 34 at 23 3 16 at 56 Scale: 1 cm = 50 mm (a) Locating instantaneous centres 15 Fig.2.65 Whitworth mechanism (b) Circle diagram