Here is a summary of our major developments over the years.
1905 |
Weston Standard Cells-first commercially manufactured in England by H. Tinsley |
1908 |
Drysdale Phase Shifters |
1909 |
Non-Inductive Shunts -Drysdale
Ayrton Mather Moving Coil Galvanometers |
1910 |
Vibration Galvanometer Drysdale & Tinsley
Tinsley Vernier Potentiometer with Slide Wire |
1912 |
Drysdale a.c. Polar Potentiometer
Standardizing Bridge
Torsion Head Dynamometer Polyphase Wattmeter-
Drysdale
Kelvin double bridge with standards |
1914 |
Optical Parallelism tester for checking binoculars
Syphon Recorders and Telegraph Apparatus
Absorption Photometer for testing whiteness
Condensers for Submarine Cables and Artificial
Lines
Precision Mica Condensers |
1915 |
Engine Testing Stroboscopic Speed measuring
Apparatus with Dr. Aston |
1920 |
High Precision Vernier Potentiometer |
1921 |
Introduction of self-contained Reflecting Galvanometer |
1922 |
Gall Co-ordinate A.C. Potentiometer |
1925 |
Continuously pumped Cathode Ray Oscillographs
for explosion tests. Forerunner of the electron microscope |
1926 |
Non-Inductive Coils and Resistance Boxes |
1927 |
Very large d.c. shunts up to 30,000 amps
Current Transformer Calibrating Equipment |
1928 |
Apparatus for duplexing submarine cables
Coxes Submarine Cable Relays
Smith Bridge for Precision Platinum Resistance Thermometry |
1930 |
Tuning Forks and Phonic Motors with Dr. A.B. Wood
A.C. short circuit shunts up to 200,000 amps |
1930 |
Marine Biological Apparatus with Dr. W.R.G. Atkins
Iron Testing Equipment
High Precision Vernier Potentiometer |
1932 |
Geophysical Prospecting equipment using electrical methods - Mr. A. Broughton Edge |
1933 |
Moving Coil Vibration Galvanometer
Instrument Switches Dual Contact |
1936 |
Self-contained illuminated galvanometers as limit bridges for high speed equipment testing |
1939 |
Mast Head wind direction indicators for J. Class Yachts
Galvanometers with optical magnifiers
Galvanometer d.c. Amplifier for automatic control
Submarine detecting apparatus
Air interception radar apparatus
Strain Gauge Bridges
Radio Sondes
Anemometers
Helographs. Auto pilot test gear
Shell hardness testers |
1944 |
A.C. and D.C. Stabilisers
Flour Colour Graders
Platinum Resistance Thermometers |
1959 |
Very High Precision Potentiometer for discrimination to 1 part in 10,000,000
Infra red bolometers |
1961 |
Infra red Fault Locating equipment
Galvanometer amplifiers |
1962 |
Automatic Current Controllers applied to automatic
precision measurement |
1963 |
Stabaumatic Potentiometer
Automatic Flour Graders
Inductive Ratiometers
Automatic Potentiometers |
1965 - 7 |
Decade Inductive Voltage Divider |
1965 |
Temperature Controlled Standard Cell Enclosure 12 Cells
Temperature Controlled Standard Cell Enclosure 4 Cells |
1966 |
Self Calibrating Volt Ratio Box |
1967 |
Inductively Coupled Temperature Bridge (NPL design) |
1969 |
AC/DC Standard Resistors (NPL design F J Wilkins)
Thermodynamic Efficiency Bridge |
1970 |
DC Submarine Cable Test Set
Digital Coil Turns Tester
Rhodium/Iron Thermometers NPL design Dr R L Rusby |
1971 |
Series 3 Flour Colour Grader |
1974 |
Organic Pollution Monitor
Direct Reading AC Comparison Bridge for Standard Resistors |
1976 |
Hydraulic Efficiency Bridge
Digital Power Loss Measuring System (British Steel) |
1977 |
Direct Reading AC Resistance Thermometer Bridge (NPL design Dr R B D Knight)
Digital Milliohmeter |
1978 |
Digital Micro-Ohmmeter
Improved Version of the DC Submarine Cable Test Set
Lift Overload Indicator
Transformer Core Tester |
1979 |
Shorted Turns tester |
1982 |
Automatic AC Resistance Thermometer Bridge |
1984 |
Temperature Controlled Enclosure for Standard Resistors |
1985 |
Series 4 Flour Colour Grader |
1986 |
Field of Vision Analyser (Dr Henson)
Three Range Automatic Resistance Thermometer Bridge
Electroding Generator |
1987 |
Single Channel Strain Gauge Meter
10 Channel Strain Gauge Meter |
1989 |
Programmable Automatic Resistance Thermometer Bridge
Digital Micro-Ohmmeter with Auto zero |
1990 |
Micro-Ohmmeter for Transformer Testing |
1991 |
Electroding Detector |
1994 |
Short Haul Submarine Cable Test Set |
1996 |
Coil Turns Tester with Computer Interface
Submarine Cable Test Set Mk V |
1999 |
25 Amp Micro-Ohmmeter
100 Amp Micro-Ohmmeter
200 Amp Micro-Ohmmeter |
2000 |
Beach Probe for Locating Submarine Telephone Cables. |
2008 |
Macular Pigment Optical Densitometer (MPOD) |
2011 |
Henson 8000 Visual Field Analyser |
2011 |
Improved design of the DC Submarine Cable Test Set for repeatered networks |
