Two — (Continued) •cycle engine cylinder, Ports in, §15, p6. -cycle engine, Koerting, §11, p42. -cycle engine, Operatim of, §11, p32. -cycle engine, Single-cylinder valveless, §14, p7. -cycle engine. Three-port, §11, p38. -cycle gasoline automobile engine, Pour- cylinder, §12, p43. -cycle marine engine, Single-cylinder, §12, p45. -cycle marine engines, Multicylinder, §12, p50. -cycle marine gasoline engines, §12, p45. -cycle oil engine, Single-acting, §14, pll. -cylinder gasoline automobile engine, Two- cycle, §12, p39. -cylinder two-cycle gasoline automobile engine, §12, p39. or three-cylinder vertical gas engine, §14, p30. -stroke cycle, Operations of, §11, p38 -stroke cycle, Variations of, §11, p40. -to-one shaft, §15, p27. Unit, British thermal. §9, pl2. of work, §9, p37. Valve, Angle check, §15, p36. Balanced check, §15, p36. Cam-shaft, §15, p27. Engines with hit-or-miss control of the fuel, §13, p4. gearing, Spiral, §15, p28. gearing, Spur, §15, p29. Hot- tube igniter with timing, §14, p32. springs, §15, p27. Swing check, §15, p35. Valveless two-cycle engine. Single-cylinder, §14. p7. Valves, Action of mechanically operated, §15, p27. and valve mechanism, §15, p23. Check, §15, p35. Engines with hit-or-miss control of ex- haust, §13, p29. Mushroom, §15, p23. Poppet, §15, p23. Vaporization, Ebullition and, §9, p26. Latent heat of, §9, p30. Vaporizer, Oil-engine, §13, pfiO. Vapor tension, §9, p29. Variable cut-off engine, §11, p26. -stroke engine, Atkinson, §11, p26. Vertical automobile engine, Single-cylinder §12. p8. automobile engines, Double-cylinder 512, pl5. centrifugal governor, Gas engine with, 513, p45. flyball governor. Gas engine with, §13, pl3. flyball governor, Gasoline engine with, $13, P4. flyball governor, Oil engine with, §13, p47. gas and gasoline engines, Single-acting, §14, pl7. gas engine, Two- or three-cylinder, §14. p30. gasoline engine. Single-acting, §14, p24. single-acting stationary oil engine, §14, p34. Volume of air required for complete combus- tion of any hydrocarbon, §10, plO. of gaseous mixtures, §9, p22. •pressure diagram, §11, plO. Volumes, and temperatures, Mixture of two quantities of air having unequal pressures. §9, p25. W Water-cooled automobile engines, §12, pi. -cooling system for stationary gas engines §14, p47. gas, Analysis of, §10, p37. gas, Coal and oil required for, §10, p38. gas, Composition of, §10, p37. -gas machines, §10, p38. -jackets, §15, plO. Wear in bearings, Taking up, §16, p35. Weight, Atomic. §10. p4. Chemical combination by, §10, p3. Molecular, §10, p5. Work, Conversion of heat into, §11, p4. External. §9, p40. in a gas engine, §11, p8. Internal, §9, p40. Negative, §11, pll. Positive, §11, pll. Unit of, §9, p37. Worm-cam, §15, p32. Zero, Absolute, §9, p6.