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2775736 Valve locating device, Othmar W Pies, William H Middendorf, Jr Carl F Evert, Aqua Survey & Instr Co, 1956-12-25, 324/260; 33/345; 116/303; 324/156; 324/326; 33/348; 324/67; 324/228 - |
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1639229
Latitude indicator for aircraft, George
P Luckey, 1927-08-16, 356/250 - used a magnetic dip needle (10)
and pendulum (11). |
Description
The body is about 3-1/2" diameter. As received the needle was out of it's bearings. The cover glasses on both sides can easily be removed to access the pivots'. There is a shipping stability Split pin (Wiki) that can be inserted on either side near the top which captures the needle making it less likley to be jarred out of the pivots. Note in Fig 2 I have the split pin in the storage/ship position.
In Fig 2 and Fig 3 you can see a small spring near the pivots on the white painted part of the needle. This can be moved along the needle. These are common on normal magnetic compasses and used to counter balance the downward force on one end of the needle so that the needle sits level. Without this feature on a magnetic compass the needle tends to jam or have high friction and so is sticky. But I don't see why this weight/spring is on a dip needle. Let me know why it's there.
Photos
Fig 1
Fig 2
Fig 3
Patents
Looking for WS Darley & Co but no Dip Needle patent found, but many pumps.Here are some that might be related.
108555 Improvement in compasses for mining, J. Blomgren, Oct, 25, 1870, 33/355R; 324/259 -
887140 Dipping needle, Pascal H Stedman, 1908-05-12, 33/355R; 324/259 -
961298 Prospector's needle, Dell W Jewell, 1910-06-14, 324/345; 324/259 -
1947809 Miner's compass or dip needle, William F Sprengnether, 1934-02-20, 33/355R; 324/259 -
2461864 Instrument for geophysical exploration, Zuschlag Theodore, 1949-02-15, 324/259; 33/355R; 33/352 -
3142122 Magnetic instrument, Boepple Otto Hartwig, Kenyon Inst Co, 1964-07-28, 33/352; 33/359; 33/355R; 324/259 -
Used in oil exploration then . . .
1980100 Electromagnetic process for surveying the deviations of drill holes, Schlumberger Conrad (Wiki) Services Petroliers Schlumberger SA, 1934-11-06, - using the 3D Earth's magnetic field to plot the path of a bore hole. Makes use of an Induction Compass (Navigation) and pendulum. Later this was expanded to learn about the nearby soil.
3014177 Electromagnetic earth surveying apparatus, Ernest T Hungerford, Charles H Fay, Shell Oil, 1961-12-19, - mentions: self-potential dipmeter, the resistivity dipmeter, and the microlog dipmeter. For measuring the Earth's magnetic field (Wiki, Sensors). The patent works with the soil resistivity and Eddy Currents (Wiki).
Also see Ground Water EM Survey.
3 Axis Magnetometer - field instrument
Aircraft Pilot's Standby Magnetic Compass B-16
DC Gaussmeter Model 1
AMY6 Magnetic Polarity Tester
GE Gauss Meter & Reference Magnet
Electromagnet Toy Engine
Fluxgate (& other) Patents
Helmholtz Coil
Sensitive Research Instrument Co. Fluxmeter
Annis M25 Pocket Magnetometer
Cenco Scientific 79860 Dynamo Analysis Apparatus - works with Fluxmeter
M3 Coil Magnetic Survey Instrument &
Ruska Helmholtz Coil
Home Built Magnetometers
HP 428 Clip-on Milliammeter Magnetometer
HT20 2000 mT Magnetic Flux Meter
KVHC100FG KVH C100 Flux Gate Compass module
Magnetics
Magnets
MC1 MC-1 Magnetic Compass Calibration Set similar to AN/ASM-344
Permanent Magnet DC Motors
Sonobuoys use magnatometers
Telegraph Telegraph Equipment, Stock Ticker, District Telegraph, Teletype, Keys, Relays, Sounders, Veedre Counter, Early Connectors, Electro-magnets
Torpedoes tried to use magnetic exploders
Weeden-El-Mtr Weeden DC Electro0magnetic Machine (Motor or Generator)Wireless Driveway Monitor - STI-34100 solar power magnetometer
Kenyon College, Ohio - Instruments for Natural Philosophy - Electricity - The Dip Needle - a page of photos of old ones.Back to Brooke's PRC68, Products for Sale, Sensors, Military Information, Personal Home page
These show up on eBay from time to time.
page created 5 July 2003.