context: The next major step occurred when James Watt developed (1763–1775) an improved version of Newcomen's engine, with a separate condenser. Boulton and Watt's early engines used half as much coal as John Smeaton's improved version of Newcomen's. Newcomen's and Watt's early engines were "atmospheric". They were powered by air pressure pushing a piston into the partial vacuum generated by condensing steam, instead of the pressure of expanding steam. The engine cylinders had to be large because the only usable force acting on them was due to atmospheric pressure.
question: ওয়াট, বোল্টন এবং স্মিয়াটন ছাড়াও, যাদের ইঞ্জিন ছিল বায়ুমন্ডলের নকশা?
answers: Newcomen's Newcomen's Newcomen's and Watt's Newcomen