the passageways between pressure and buy them as they would a pair of boots. Com- tical axis or line passing from a distant object cen- valve, L, and pressure valve collar, M. As the pres- sure increag :in the delivery chamber around the de- trally through both lenses. This eyepiece, a, also livery… … difficulty in understanding the remaining parts at 13 to 15 pounds steam pressure and work from that of the instrument. In testing for hypermetro- point up to 250 pounds steam pressure, giving it a tician, but those who do get their ‘“‘views enlarged” pia, the draw tube is closed, 0 being indicated…
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