Apollo construction spreads a mass program across British yards

The ships came from builders on the Thames and Clyde, the royal dockyards at Devonport and Sheerness, and Armstrong Mitchell's Elswick yard. Distributing sister ships among public and private yards turned the Apollo design into a national shipbuilding program rather than a single-yard production run. The list makes the scale of the twenty-one-ship order tangible because state and commercial capacity had to work in parallel. Sirius and Spartan also connect the class directly to the Elswick cruiser tradition that influenced its simple lines.