- Lilienthal's Experiments
- Lockheed A-29&A
- Lockheed C-40A
- Lockheed C60-A
- Lockheed P-38D&E
- Locomotive of To-day
- London Hackney Cab (Boulnois’ Patent)
- Looping the loop
- Mail Coaches Racing - Something Wrong with the Opposition Coach
- Man lifting a 100 horse-power aeroplane motor
- Marion Model 7, 22–24 H.P
- Martin A-30
- Martin B-10B
- Martin B-26 B& C
- Maurice Farman Biplane
- Methods to get to the right place in a garage
- Miller’s twin boat on Loch Dalswinton, 1788
- Minot’s Ledge Light
- Mississippi steamboat ‘J. M. White,’ 1878
- Montgolfier’s experimental balloon
- Montgolfier’s passenger balloon
- Morning Post dirigible, 1910
- Mouillard’s aëroplane
- Mr. Daniel Bourn’s Roller Wheel Waggon -1763
- Multiple-engined craft
- Naval battle with planes launched from ships
- North American AT-6A
- North American B-25 C & D
- North American O-47A& B
- North American P-51
- Northrop A-17
- Octave Chanute experimenting with his gliders on the Michigan sand dunes
- old times sketch
- On The Banks
- Original Wright Biplane
- Out for a ride
- Overtaking a tram
- P.G. and E Car at Oak Park
- P.G. and E Carbarns at 28t hand N, 1914
- P.G. and E. Car 37, A wooden type, on the 3 line, 1941
- Parking
- Parts of a motorbike
- Parts of a motorbike (2)
- Penaud’s aëroplane toy, 1871
- Pennsylvania, 35 H.P. Pennsylvania Auto Motor Co., Phil., Pa.
- Phantom illustration of Benz' first automobile
- Phillips’s Experimental Craft
- Pickering's American Velocipede
- Pilot and passenger
- Pioneer Locomotive
- Pioneer Locomotive
- Pioneer Locomotive
- Plan of a Behr Mono-Railway Car
- Plan of a Chesapeake Bay terrapin smack
- Plan of a large Chesapeake Bay sharpie taken from remains of boat
- Plan of Harpers Ferry Bridge
- Plan of North Carolina sharpie of the 1880's
- Plan of North Carolina sharpie schooner taken from remains of boat
- Plan of typical New Haven sharpie showing design and construction characteristics
- Plane going down in flames