Coal- Fired Furnace Valmont Power Station, Xcel Energy Inc., Boulder, Colorado Image Credit: Tom Yulsman

Torino 380

Screw compressor screws

Source: https://imgur.com/ZA84vut

Constant-velocity joints (aka homokinetic or CV joints) allow a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play. They are mainly used in front wheel drive vehicles, and many modern rear wheel drive cars with independent rear suspension typically use CV joints at the ends of the rear xle halfshafts and increasingly use them on the propshafts (drive shafts).

                  Most great people have achieved their greatest

                  success just one step beyond their greatest failure.

(vía https://www.youtube.com/watch?v=dLo404voSp8)

Arc furnace

Source: https://imgur.com/6KPYeAl