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Velocipede Carriage 1881
The engraving shows a light and compact velocipede carriage of German invention, 
Velocipede Carriage in 1881calculated for easy and comfortable riding and capable of carrying light baggage. The rider 'sits in an easy chair above the forward axle, and grasps the guiding handles attached to this axle. The feet rest upon pedals connected by rods with cranks on the rear axle. By the alternate movement of the pedals the carriage is propelled. A lantern is carried in front, and a canopy covers the head of the rider.
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Pacemaker Code Chart
Positions I, II, and III identify the chamber paced, chamber sensed, and mode of
response to conventional (P- and/or R-wave) sensing, respectively. The fourth position
indicates rate modulation (adaptive-rate pacing).
see http://www.machine-history.com/Cardiac%20Pacemaker
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Revolving Track Wheel for Binder Bull Wheel
Popular Mechanics November 1925
Giant Revolving track for a binder bull wheel.
Reaper Bull Wheel Improvements
Farmers for thousands of years harvested grain crops by hand. They could cut the stalks, stack them in large piles, then store them in a silo. It took many people to do these tasks, until in 1831 Cyrus McCormick (and later others) developed the reaper, a machine that cuts the stalks with reciprocating knifes after a reel leans the standing grain towards the rack, platform or endless canvas. McCormick's reaper required two people, one to ride and guide the horse pulling it, and the other to rake cut grain off the platform into a windrow on the ground.
PEM Fuel Cell Diagram
This is a diagram of a basic PEMFC Proton Exchange Membrane Fuel Cell.
The diagram shows the anode, cathode, hydrogen, oxygen paths, gas diffusion backing, catalyst electrode layer, PEM membrane.
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An Electrical Machine 1856
Electrical Machine.
EXPLANATION OF THE MACHINE. 
Self-Moving Railway Carriage on Trundling Cones 1829
8
September 1871 The Galaxy
Also maybe in The Mechanic's Magazine, London, 1829 which shows a perpetual motion railway.
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The Horse Collar
Man began using animal power beginning with oxen yoked in Mesopotamia and Egypt. Horses later were used for transportation but still the ox did the plowing, mill work etc.