time of an accurate clock (mean series of radial steam ports whose cross section is to prevent them from turning. They are formed time) and the time indicated by a sun-dial (true time). curved as shown at A’, which is a section on the with annular flanges which overlie a series of rotating This… … frame a lens holder is carried, next, which is shorter, but of larger hinged at its lower end and pro- diameter to allow for expansion, vided with a lens, the focal point and so on until the discharge pipe of which lies exactly on the line is reached. By constructing each joining the pivots of the…
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