Jacques Wardlaw Redway

“ The moisture from the body sooner or later affects the metal mechanism; moreover, the knocking and banging which it is likely to receive if carried in an overcoat pocket are equally hurtful. In traveling, it is carried most safely in a grip sack.
A very good place for the pocket aneroid is the observer’s desk and it is advisable to set the zero mark of the altitude scale daily at the index position. Thereby is inculcated a habit of watching the barometric changes far more closely than is the custom when one must go across the room to set the mercurial barometer for a reading. ”

“ It therefore must be held in its habitual position when the adjustment is made.
If the error in reading is two- or three-tenths, the observer must watch the readings for several days to ascertain if the adjustment has changed. If the index has been set forward it is apt to “creep” forward still further; if backward, the creeping will be backward. The reason therefor is not known with certainty. An aneroid taken to a higher elevation is apt to respond quickly to the reduced pressure; taken to a level materially lower, it may not respond so quickly. ”

“ When this cannot be done without delay, the error may be temporarily reduced, for convenience in reading, to even tenths of an inch. If it is desirable to have the index read to sea level reduction, it may be lifted off the stud and replaced as nearly as possible in the correct position. ”

“ A milled screw adjusts the pressure of the pen on the paper, and a switch enables the observer to throw the pen off or on at pleasure. The drum makes one revolution per week. The record sheets are ruled with horizontal lines representing inches, halves, and twentieths. Arcs of circles, having radii equal to the length of the pen arm, divide the record sheet into midday and midnight periods, and two-hour intervals. Eight o’clock Monday morning is the normal time for changing the record sheets used by most observers. These contain day and month spaces for ”