What an impact wrench looked like in 1934. 😊
This gigantic wrench fits the RMS Queen Mary's propeller fixing nuts. For reference, the person’s legs in the photo of the nut have a 34-inch/86 cm inseam—which probably makes this a 32-inch/81-cm nut and wrench for same. 😮
The wrench was turned by sledgehammer—presumably a really, really big one.
Interestingly, the nut is grooved, as though for King Kong's safety wire—but that wasn't its purpose. In all likelihood the grooves allowed the nut, which must weigh hundreds of pounds, to be securely slung and maneuvered by block and tackle.
A single nut like this is all that secured the Queen Mary's four propellers, each of which channeled 40,000 horsepower/29,800 kW and were 18 feet/5.5 meters in diameter, weighing 32 tons/29,030 kg.
Definitely what you'd call a critical fastener. And no torque wrench. 😱