How to Succeed as an Inventor / Showing the Wonderful Possibilities in the Field of Invention; the Dangers to Be Avoided; the Inventions Needed; How to Perfect and Develop New Ideas to the Money Making Stage

by Goodwin Brooke Smith

18. Transmission of two speeds by gearing. The hand is shown on the loose left hand pulley of the lower three. When it is moved on to the middle pulley, which is keyed to the shaft carrying the small pinion, a slow motion is transmitted to the lowest shaft; but when, it is on the right-hand pulley, which is fast to the outer shaft carrying the large spur-wheel, a quick speed is transmitted.

19. Transmission of two speeds by means of belts. The two outer pulleys on the lower shaft are loose, the two inner fast. With the belts arranged as shown, the speed of the lower shaft is slower than when both are traversed to the right.

20. An intermittent circular motion in the direction indicated by the arrow is transmitted to the wheel A, by means of the oscillating rod D and the pawl B, from the reciprocating rectilinear motion of the rod C.

21. The continuous rotation of the shaft carrying the two cams or wipers gives to the rod A an intermittent alternating rectilinear motion. The rod is raised by the action of a wiper on the projection B, and it falls by its own weight. This contrivance is used in ore-stampers or pulverizers, power-hammers, &c.

22. The reciprocating rectilinear motion of the rod on the right produces intermittent circular motion of the wheel by means of the elbow-lever and the pawl. The direction of motion of the wheel is determined by the side on which the pawl works. This contrivance is used in giving the feed-motion to planing-machines and other tools.

23. The piston-rod and crank motion used in the steam-engine. The reciprocating rectilinear motion of the former is converted into the rotary motion of the latter through the agency of the connecting-rod (not shown).

24. An eccentric, such as is used on the crank-shaft of steam-engines for communicating reciprocating rectilinear motion to the slide-valves. It rotates round an axis not pushing through its centre.

25. Internal spring pawls for a ratchet brace. The ratchet can revolve only in one direction (counterclockwise), and as it does so the springs are gradually compressed and suddenly released in turn.

26. Friction pawl feed motion, silent. The arrow shows the direction of rotation of the wheel. The principle of the contrivance is obvious.