The lengths of the links comply with the condition: A͞C=A͞B. Crank 1, rotating about fixed axis A, is connected by turning pair C with slider 2 which moves along the slot of link 3. Link 3 rotates about fixed axis B. Crank 1 rotates slotted link 3 about axis B. The transmission ratio between links 1 and 3 equals i₁₃=ω₁/ω₃=2 where and are the angular velocities of links 1 and 3. Thus slotted link 3 makes one revolution to two revolut ions of crank 1.
$931$LG,4L$