From September 2018 Newsletter:

• Military Service Records

• McDonald Geodetic Observatory

• Wild T0 Magnetic Theodolite

Other Links:

• Photomapping Patches

• Photomapping History

• Smithsonian Historical Survey Instruments Theodolite Page

• Smithsonian Historical Survey Instruments Geoceiver Page

• Illustration of the Geoceiver AN/PRR-14 (image credit: JHU/APL)

• Development of Receivers to Characterize Transit Time and Frequency Signals - Geoceiver AN/PRR-14

• Transit - US Navy Navigation Satellite System (NNSS), User Segment - Geoceiver AN/PRR-14

• AGA Geodimeters, Models 4D and 4L (NOAA Anniversary site)

• Geodimeter 8 control panel.jpg (From Wikimedia Commons)

• Geodimeter 8 in use.jpg (From Wikimedia Commons)

• SMDC Optical Sensors

• BC Cam Z Photo

• T3 Photo

• T4 Photo

• Kern DKM 3-A Manual

• Gravity Meter Manual

• Monroe Hand-Crank Calculator

• Marchant Calculators

• Museum of HP Calculators

• Olivetti Desktop Computer

• Earth Observation Portal Home Page

• Wikimapia GSS Page