Surveyor Transit

How to judge the distance by estimation?

Does anyone know how to estimate distance when u looking at something far far away?

eg. a boat in the ocean, using ur hand as a ratio and estimating the size of the boat and calculate the distance.????
does this work?

any other good ways?

Comparing size with your hand to determine distance as you suggest requires that you know the height of the object.

Radioshack sells a device to measure distances at the golf course. It assumes that the flag is a standard height so it compares its apparent height to a scale calibrated in yards.

Without knowing such a height for comparison you range measurement will only be as good as your estimate of the object size.

Our eyes measure distance by the angles our eyes make when looking at an object. THis is why your eyes cross when looking at the tip of your nose. Each eye is taking a seperate image from a different horizontal position (the space between your eyes) and the muscles are angling each eyeball so as to provide a smooth image (no overlap) This is how we can tell if something is close or far away.

This concept was used in Artillery of WW1 and prior to electronic ranging. A special set of binoculars with the lenes several feet apart were used to measure range. A set of prisims and mirrors would be adjusted so that the overlapping images would focus on the object of interest (a tank etc) when the images aligned it was easy to compute the range using trigometery as a base distance between left and right lenses was known and measured angles determined. In combat a calibrated scale was provided on the adjustment knob so very quick range measurments could be determined.

A device such as this would be useful on a moving platform such as a ship as it is a quick measurement. If you use a surveyor transit you can determine ranges and elevations of fixed objects quickly by using similar technique by moving the transit a known horizontal distance and measuring angles to a fixed object.

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Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
$251.99
Antique 1904 1910 Buff  Buff Mfg Boston Surveyors Level Transit Serial 7224
Antique 1904 1910 Buff Buff Mfg Boston Surveyors Level Transit Serial 7224
$295.00
Vintage Chicago Steel Tape Co Surveyors Measure Stick Transit Pole Wooden Survey
Vintage Chicago Steel Tape Co Surveyors Measure Stick Transit Pole Wooden Survey
$34.00
Montgomery Ward Power Kraft Model 84 6464 Transit Surveyor With Stand
Montgomery Ward Power Kraft Model 84 6464 Transit Surveyor With Stand
$39.99
David White Universal Transit Level in Case with Tripod  Plumb Bob Surveyor
David White Universal Transit Level in Case with Tripod Plumb Bob Surveyor
$110.08
Sosho Surveyor Transit Automatic Level Model DsZ3 22A Made in Japan With Case
Sosho Surveyor Transit Automatic Level Model DsZ3 22A Made in Japan With Case
$75.00
Sokkisha Surveyor Transit Automatic Level Model C3E D10346 Made in Japan Case
Sokkisha Surveyor Transit Automatic Level Model C3E D10346 Made in Japan Case
$75.00
Vernier Transit Theodolite For Surveying  Construction  Surveyor Instrument
Vernier Transit Theodolite For Surveying Construction Surveyor Instrument
$358.00
Vintage Seiler Surveyor Transit Wooden Box Plumbob Model 65
Vintage Seiler Surveyor Transit Wooden Box Plumbob Model 65
$99.00
K  E PARAGON SURVEYING TRANSITKEUFFEL  ESSER COMPASS SURVEYORSTHEODOLITE
K E PARAGON SURVEYING TRANSITKEUFFEL ESSER COMPASS SURVEYORSTHEODOLITE
$695.00
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
$341.99
K  E PARAGON SURVEYING TRANSIT KEUFFEL  ESSER COMPASS SURVEYORS THEODOLITE
K E PARAGON SURVEYING TRANSIT KEUFFEL ESSER COMPASS SURVEYORS THEODOLITE
$425.00
Crain Mound City 25 Surveyors Measure Stick w Tenths 903040 Transit PoleSurvey
Crain Mound City 25 Surveyors Measure Stick w Tenths 903040 Transit PoleSurvey
$50.00
Vintage Surveyors Engineers Transit THS Model 7100 Japan with Domed Case
Vintage Surveyors Engineers Transit THS Model 7100 Japan with Domed Case
$99.99
made in Ukraine modern optic surveyor transit level N 3KL BOX h 3kl
made in Ukraine modern optic surveyor transit level N 3KL BOX h 3kl
$59.99
David White 14 Measuring Stick Surveyor Transit Pole Extendable Telescopic
David White 14 Measuring Stick Surveyor Transit Pole Extendable Telescopic
$149.99
Pentax GT 4B Surveyor Glass Circle Transit Theodolite w Case
Pentax GT 4B Surveyor Glass Circle Transit Theodolite w Case
$119.99
LIETZ SOKKISHA C3E Automatic Level Transit Surveyor Scope AS IS Parts or Repair
LIETZ SOKKISHA C3E Automatic Level Transit Surveyor Scope AS IS Parts or Repair
$29.95
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
$250.00
Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
$224.99
VINTAGE Vesco Transit Wood Surveyors Grade Stick Gradechecker Survey Very Rare
VINTAGE Vesco Transit Wood Surveyors Grade Stick Gradechecker Survey Very Rare
$50.00
brunson vintage transit 550910 surveyor tool layout good condition
brunson vintage transit 550910 surveyor tool layout good condition
$250.00
++ THS SURVEYORS TRANSIT NO 262 31726
++ THS SURVEYORS TRANSIT NO 262 31726
$375.00
David White Model 8202 Surveyor Level Compass Transit  Case self standing
David White Model 8202 Surveyor Level Compass Transit Case self standing
$149.00
Pentax GT 6B Glass Circle Surveyors Transit Theodolite w Case
Pentax GT 6B Glass Circle Surveyors Transit Theodolite w Case
$79.99
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
$328.63
VINTAGE SURVEYOR TRANSIT LEVEL made by troughton  simms london
VINTAGE SURVEYOR TRANSIT LEVEL made by troughton simms london
$499.00
David White 8114 Surveyors Transit Builders Level  D W 9015 Tripod Plastic Case
David White 8114 Surveyors Transit Builders Level D W 9015 Tripod Plastic Case
$155.00
Antique Fennel Kassel Surveyors Transit No 132668 with wooden box
Antique Fennel Kassel Surveyors Transit No 132668 with wooden box
$124.95
Rare Vintage Swiss Made Kern Aarau Surveyor Transit Level
Rare Vintage Swiss Made Kern Aarau Surveyor Transit Level
$159.87
Kern Aarau GK1 Surveyor Transit Level Rare Vintage Swiss Made Free Shipping
Kern Aarau GK1 Surveyor Transit Level Rare Vintage Swiss Made Free Shipping
$171.98
Bostrom Brady Model 5 Surveyors Transit in Wood Case
Bostrom Brady Model 5 Surveyors Transit in Wood Case
$55.00


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