This is the text present in Chapter 11 of H.G. Wells's The Time Machine as serialized in the New Review. It was cut from the book but later published on its own as a short story, "The Grey Man."
A simple test of whether something is only incidentally sci-fi, or not sci-fi at all despite being in a sci-fi setting, is whether the story could take place in a known society without changing its message.
Our society is organized around a scarcity economy to such an extent that many people believe 'scarcity' and 'economy' mean the same thing. Even if it were true, different economies deal with differently scarce things.
a digital signal processing (DSP) technique for identifying frequency components of a signal, published by Dr. Gerald Goertzel in 1958. While the general Fast Fourier transform (FFT) algorithm computes evenly across the bandwidth of the incoming signal, the Goertzel algorithm looks at specific, predetermined frequency.