EQUIPMENT AND SUPPLIES - Microbarograph Charts (No. 5-1071-I)

                           UNITED STATES
                    DEPARTMENT OF THE INTERIOR
                         GEOLOGICAL SURVEY
                     Water Resources Division
                        Washington 25, D.C.

In reply refer to:                              April 11, 1958
                                                Code 4052 0001


To:       District Chiefs and Staff Officials, GWB

From:     Assistant Chief, Ground Water Branch

Subject:  EQUIPMENT AND SUPPLIES - Microbarograph Charts
                                   (No. 5-1071-I)

It has been suggested that much time and numerous routine
arithmetic calculations could be avoided if barograph charts were
calibrated in feet of water instead of inches of mercury.

Mr. G. E. Siple, of the Columbia, South Carolina ground water
office has contacted the Instruments Corporation of Baltimore,
Maryland regarding the feasibility of supplying the above
microbarograph charts, (No. 5-1071-X) calibrated in feet of water
rather than inches of mercury.  The company does not now
manufacture such charts but has indicated that an initial minimum
"run" of 3,000 charts could be made at a cost of about $500 to
allow for engineering and production development charges.

The purpose of this memorandum is to inquire whether other field
offices of the Ground Water Branch are sufficiently interested or
would have sufficient need of a revised "air-pressure/feet of
water chart" to warrant the expenditure of funds to produce these
charts.  Interested field offices are requested to supply an
estimate of their annual needs by April 28.  If there is a large
enough demand for these charts, the Washington office will
underwrite initial production costs.  It is assumed that
subsequent orders for new charts will cost no more than the
present charts, once the initial development costs have been

Interested field offices may reply to this memorandum by filling
in the following form, and returning this sheet to the Washington

                                      (s) Clyde S. Conover

Distribution:  A, B, GS, GFO