air-hardened steel
51Cox model engine — Cox Model Engines Cox Fokker DVII Ready To Fly Control Line Model Plane …
52Rolling resistance — Figure 1  Hard wheel rolling on and deforming a soft surface, resulting in the reaction force from the surface having a component that opposes the motion. Rolling resistance, sometimes called rolling friction or rolling drag, is the… …
53Sheet metal — Sheets of stainless steel cover the Chrysler Building …
54Armament of the Iowa class battleship — The armament of the engaged the Imperial Japanese Navy battlecruiser Kirishima at a range of convert|18500|yd|m| 2 at night.cite book | last = Mindell | first = David | title = Between Human and Machine | publisher = Johns Hopkins | date = 2002 | …
55Charles Rumney Samson — Born 8 July 1883(1883 07 08) Crumpsall, Manchester Died 5 February 1931(1931 02 05) (aged 47) Salisbury, Wiltshire …
56Cox Model Engines — are used to power small model airplanes, model cars and model boats. Cox engines were in production for more than 50 years between 1945 and 2006 by L.M. Cox Manufacturing Co. Inc. who later became Cox Hobbies Inc. and then Cox Products before… …
57Tube bending — Bent tubing Shown is a trombone, it displays some U bends Tub …
58Phonograph — Turntable redirects here. For other uses, see Turntable (disambiguation). Edison cylinder phonograph ca. 1899 …
59Project Nike — Nike missile family on display at Redstone Arsenal, Alabama. From left, MIM 14 Nike Hercules, MIM 23 Hawk (front), MGM 29 Sergeant (back), LIM 49 Spartan, MGM 31 Pershing, MGM 18 Lacrosse, MIM 3 Nike Ajax. Project Nike was a U.S. Army project,… …
60Terminal ballistics — Terminal ballistics, a sub field of ballistics, is the study of the behavior of a projectile when it hits its target. It is often referred to as stopping power when dealing with human or other living targets. Terminal ballistics is as relevant… …
