Instructions for taking and recording meteorological observations and for preserving and repairing instruments : prepared for use of field and astronomical parties of expeditions for geographical explorations and surveys west of 100th meridian / compiled from Colonel Williamson's use of barometer, and from published instructions of U.S. Lake Survey, with such additions and modifications as have been suggested by experience of this survey; to which are appended barometrical tables I to XI, inclusive, of Professional Papers Corps of Engineers, No. 12.