By Christopher F. Shores
An enticing brief yet whole background of the Finnish Air strength from its formation to 1968. initially released by way of Osprey united kingdom, in 1969. Softcover, huge layout, nearly fifty six un-numbered pages (including covers on additional heavy smooth paper inventory. Covers have name and colour representation on entrance. again hide has b/w classic images. . good illustrated with b&w pictures, 8 pages of color work, 3 pages of b&w drawings, colour-coded. (from the Amazon evaluation by way of KIWI.)
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Additional resources for Finnish Air Force 1918-1968
The frequencies corresponding to the octaves on a piano progress in the ratios 1:2:4:8:16:32:64:128. The logarithms (to base 2) of these numbers are in a much simpler progression ± 0, 1, 2, 3, 4, 5, 6, 7 ± and these equal intervals are exactly how we perceive the musical scale. Frequency is not the only thing that the ear measures in this way: changes of sound volume follow the same peculiar rule. Sound volume and the ear The hairs on the basilar membrane vibrate in different degrees, depending on the loudness of the original sound.
For listeners off the centre line C, the growing difference in distance rapidly `kills' the stereo, due to the Haas effect. Listening position 1 (with the narrower spacing of speakers) has the same loss of stereo effect as position 2 (with the broader spacing). A second requirement is that the loudspeakers be matched in volume and frequency response. If the volume from one is set to be greater than that from the other, the centre is displaced and the sound stage distorted. If the difference reaches 20 dB, the centre is displaced to the extreme edge of the sound stage.
1' (for `one-tenth of the full frequency range') simply provides deep (and potentially loud) bass ± typically 120 Hz and below ± from a single, more powerful `subwoofer' loudspeaker. This can therefore be of a separate design from the other five, which in turn benefit by their isolation from its more extreme excursions and excessive harmonics. The ears make little use of frequencies below 120 Hz to localize sound sources, so a single speaker is sufficient for the sub-bass from any direction. It will usually be off-centre (because the centre line is at a node of many low frequencies), and often at the front, but otherwise position does not matter much, provided nobody gets too close.