This document specifies the requirements for a theodolite to be used for topographic surveying. The theodolite must have a 30x magnification, objective diameter of at least 40mm, field of view of 1°30' to 1°40', and be able to focus as close as 2m. It must operate between 0-60°C, have a lifetime of over 5 years, and come with accessories including staffs, cases, and manuals. The tripod must extend to 1600mm and allow mounting of the theodolite and accessories.

1. 10.026 THEODOLITE
Approval Date: 6th
, October 1999
Reviewed on : 23 October 2007 Version: 2
Equipment Specification: THEODOLITE Version 2 10.026-1/4
Purpose
The theodolite will be used for general topographic surveying application and in particular for
position fixing during discharge measurements on rivers and canals from boats.
Conditions & Requirements
• The instrument must be of reliable and simple design, adequate for the application.
• An operator’s manual shall be part of the delivery.
• The theodolite shall generally comply with IS 2976-1964.
• The tripod shall generally comply with IS 8330-1997.
Specifications
image erect
magnification 30 x
effective diameter
of objective ≥ 40 mm
field of view 1°30′ to 1°40′
shortest focussing distance 2.0 m
resolving power ±2.5 to 3.0 sec
minimum focussing
distance ≤ 2.0 m
stadia ratio 1:100
• stadia multiplier 100
• stadia addition 0
optical plummet
• magnification ≥ 2.3 x
• focussing range ≤ 0.5 m
sensitivity of level plate 20 sec per 2 mm run
tribarch circular bubble 8 min per 2 mm run
vertical circle level 1 sec per 2 mm run
graduation error
horizontal circle 1 sec (least count of micrometer)
vertical circle 1 sec (least count of micrometer)
instrument life time >5 years of continuous operation
temperature range 0 to 60°C
housing splash waterproof
Accessories
diagonal eye-piece two (one for telescope, one for micrometer)
dark glasses dark green, light green, light blue
water proof cover made of durable plastic material
plumb bob; adopter plug one unit
tool-set spanner, tommy pins, screw driver, etc. – one set
lens cover set one set
cleaning brush one unit

2. Equipment Specification: THEODOLITE Version 2 10.026-2/4
oil bottle one unit
electrical illuminating unit Two units
re-usable desiccating one packet 200 mg, e.g. silica gel
material that may be
reactivated
Telescopic 4.0 m 2 nos., complying with IS 11961-1986
levelling staffs and
accessories
instrument manual one
carrying case one unit made of light fibre plastic wood or metal having
sufficient strength to bear normal shocks and with receptacles for
holding accessories with handle, carrying shoulder strap etc.
tripod 1600 mm
well seasoned wood or light & strong alloy telescopic with
mounting for battery, illumination unit & clamping arrangement
for the instrument
centering provision 30 to 50 mm

3. 10.026 THEODOLITE
As per HP-I
Approval Date: 6th
, October 1999 Version: 2
Equipment Specification: THEODOLITE Version 2 10.026-3/4
Purpose
The theodolite will be used for general topographic surveying application and in particular for
position fixing during discharge measurements on rivers and canals from boats.
Conditions & Requirements
• The instrument must be of reliable and simple design, adequate for the application.
• An operator’s manual shall be part of the delivery.
• The theodolite shall generally comply with IS 2976-1964.
• The tripod shall generally comply with IS 8330-1997.
Specifications
image erect
magnification 30 x
effective diameter
of objective ≥ 40 mm
field of view 1°30′ to 1°40′
shortest focussing distance 2.0 m
resolving power ±2.5 to 3.0 sec
minimum focussing
distance ≤ 2.0 m
stadia ratio 1:100
• stadia multiplier 100
• stadia addition 0
optical plummet
• magnification ≥ 2.3 x
• focussing range ≤ 0.5 m
sensitivity of level plate 20 sec per 2 mm run
tribarch circular bubble 8 min per 2 mm run
vertical circle level 1 sec per 2 mm run
graduation error
horizontal circle 1 sec (least count of micrometer)
vertical circle 1 sec (least count of micrometer)
instrument life time >5 years of continuous operation
temperature range 0 to 60°C
housing splash waterproof
Accessories
diagonal eye-piece two (one for telescope, one for micrometer)
dark glasses dark green, light green, light blue
water proof cover made of durable plastic material
plumb bob; adopter plug one unit
tool-set spanner, tommy pins, screw driver, etc. – one set
lens cover set one set
cleaning brush one unit
oil bottle one unit

4. Equipment Specification: THEODOLITE Version 2 10.026-4/4
electrical illuminating unit Two units
re-usable desiccating one packet 200 mg, e.g. silica gel
material that may be
reactivated
Telescopic 4.0 m 2 nos., complying with IS 11961-1986
levelling staffs and
accessories
instrument manual one
carrying case one unit made of light fibre plastic wood or metal having
sufficient strength to bear normal shocks and with receptacles for
holding accessories with handle, carrying shoulder strap etc.
tripod 1600 mm
well seasoned wood or light & strong alloy telescopic with
mounting for battery, illumination unit & clamping arrangement
for the instrument
centering provision 30 to 50 mm