The Kaiser intervened again in February with a request for a ship with secondary batteries of ten 21 cm or guns; the Construction Department and the "Kaiserliche Werft" (Imperial Shipyard) in Kiel submitted proposals. The first, "6B-D", was a variant on the earlier "6" design, while two others, "10A" and "10B" featured the larger guns; the submissions from Kiel have not survived and their details are not known. Wilhelm interrupted this design work by suggesting that speed should be increased significantly at the price of reducing the main battery to 24 cm guns, which resulted in further design studies that were completed by April. All of these were deemed unacceptable and further design work was carried out within the "Reichsmarineamt" (Imperial Naval Office). The officers there observed that the secondary battery should be limited to 21 cm guns, since the increased weight of the 24 cm weapons limited the number of guns. This resulted in "Project I", armed with twelve of the guns, "Project II", armed with sixteen of the guns, and "Project III", which carried eight 24 cm guns. All three variants kept a 28 cm main battery.