Surveyor Transit

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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.

Find Surveyor Transit On eBay Below:

Wild Heerbrugg Model T1A Surveyors Transit and Tripod
Wild Heerbrugg Model T1A Surveyors Transit and Tripod
$399.95
David White Instruments Surveyors Transit Level Model 8114 Untested
David White Instruments Surveyors Transit Level Model 8114 Untested
$65.00
Theodolite Transit Surveyors Vintage Surveying Instrument with wooden box
Theodolite Transit Surveyors Vintage Surveying Instrument with wooden box
$437.66
Vernier Transit Theodolite Surveyors Vintage Surveying Instrument 15
Vernier Transit Theodolite Surveyors Vintage Surveying Instrument 15
$179.00
15 Transit Theodolite Surveyors Vintage Surveying Instrument Watt Pattern
15 Transit Theodolite Surveyors Vintage Surveying Instrument Watt Pattern
$229.00
37Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
37Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
$379.99
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
$325.00
David White 14 Measuring Stick Surveyor Transit Pole Extendable Telescopic
David White 14 Measuring Stick Surveyor Transit Pole Extendable Telescopic
$95.00
Brass 15 Vernier Transit Theodolite Surveyors Vintage Surveying Instrument
Brass 15 Vernier Transit Theodolite Surveyors Vintage Surveying Instrument
$180.00
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
Vernier Transit Theodolite For Surveying  Construction  Surveyor Instrument
Vernier Transit Theodolite For Surveying Construction Surveyor Instrument
$358.00
K  E PARAGON SURVEYING TRANSITKEUFFEL  ESSER COMPASS SURVEYORSTHEODOLITE
K E PARAGON SURVEYING TRANSITKEUFFEL ESSER COMPASS SURVEYORSTHEODOLITE
$695.00
15 Brass Transit Theodolite Surveyors Vintage Surveying Instrument
15 Brass Transit Theodolite Surveyors Vintage Surveying Instrument
$178.00
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
$379.99
David White Instruments Level Model 8114 Untested Surveyors Transit
David White Instruments Level Model 8114 Untested Surveyors Transit
$79.95
Pentax GT 6B Glass Circle Surveyors Transit Theodolite w Case
Pentax GT 6B Glass Circle Surveyors Transit Theodolite w Case
$325.00
David White DW 8300 Survey Level Surveyors Transit wCase
David White DW 8300 Survey Level Surveyors Transit wCase
$75.00
K  E Surveyors Transit Tripod
K E Surveyors Transit Tripod
$89.00
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
Russian Soviet SURVEYING LEVEL N 3 theodolite transit surveyor 1976
Russian Soviet SURVEYING LEVEL N 3 theodolite transit surveyor 1976
$148.82
Montgomery Ward Power Kraft Model 84 6464 Transit Surveyor With Stand
Montgomery Ward Power Kraft Model 84 6464 Transit Surveyor With Stand
$39.99
Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
$290.00
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
$323.99
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
$373.92
YOUNG  SONS DEPT  KEUFFEL  ESSER CO VINTAGE SURVEYORS TRANSIT IN WOODEN BOX
YOUNG SONS DEPT KEUFFEL ESSER CO VINTAGE SURVEYORS TRANSIT IN WOODEN BOX
$500.00
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
$24.95
Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
$329.99
++ THS SURVEYORS TRANSIT NO 262 31726
++ THS SURVEYORS TRANSIT NO 262 31726
$500.00
VINTAGE LIETZ SOKKISHA STADIA HAIRS SURVEYORS TRANSIT IN WOODEN BOX NO 9425
VINTAGE LIETZ SOKKISHA STADIA HAIRS SURVEYORS TRANSIT IN WOODEN BOX NO 9425
$399.98
LIETZ SOKKISHA NO 10C SURVEYORS TRANSIT IN ORIGINAL METAL CASE JAPAN
LIETZ SOKKISHA NO 10C SURVEYORS TRANSIT IN ORIGINAL METAL CASE JAPAN
$299.98
David White Model 8202 Surveyor Level Compass Transit  Case self standing
David White Model 8202 Surveyor Level Compass Transit Case self standing
$139.99
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
$358.96


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