sorvico to the construction contractor. Wage rates for survey crow classifications will be requested for all such contracts. In the event that wage rates and classifications for survey crews are not included, prior to scheduled bid opening, in the wage determinations issued by the Department of Labor, it will not be necessary to delay the bid opening or the award of the contract, or to subsequently include such classifications or wage rates in such contract.

B. Survey work is not covered work if it (1) is performed by State or Government personnel or (2) is placed under separate contract for the purpose of (a) providing the State, or Government, with data for design work preliminary to preparation of contract requirements, (b) identifying reference points (defining the location of the work required of the construction contractor) or (c) supplying data for the use of the State in determining whether the contractor is complying with the requirements of the contract, which might be referred to as inspection surveying. Accordingly, survey work of the type referred to in this paragraph B is not to be regarded as "construction work" which is subject to prevailing wage requirements within the opinion of the Solicitor of Labor.

In summary:

(1) Wage rates for survey crews will be
requested for construction contracts (a) which
may involve survey work by the construction con-
tractor or (b) which are for the primary purpose
of furnishing the construction contractor with
survey work which is an aid to crafts engaged in
the actual physical construction of the project.

(2) Wage rates furnished for survey crews
by the Department of Labor for use in the advertised
specifications for highway construction work will
be used and enforced in connection with the contracts
for which they are issued. However, when such wage
rates are not furnished, there is no prevailing wage
requirement to enforce.

(3) Wage rates need not be requested for, or
used in, State or Government contracts which are for
preliminary design, specification layout, or inspection
functions, as distinguished from providing an engineer-
ing aid to the construction contractor in performing
his work.

At the left is the transit, the universal instrument of the survey crew. It is used principally for measuring horizontal and vertical angles and for prolonging straight lines. The transit has a telescope which may be revolved about either a horizontal or vertical axis, and, usually, a magnetic needle. It is mounted on a tripod.

At the right is the level, used to transfer or determine elevations. The level consists of a telescope to which is attached a spirit level tube, all revolving about a vertical axis and mounted on a tripod.

Other instruments that may be used on special surveys include the theodolite, the subtense bar, and the tacheometer.

Equipment the rodman and chainman must use and become thoroughly familiar with. In the picture, starting at the left, are:

1. The Philadelphia Rod, normally used in bridge building.
2. The right-angle prism used to project lines at right

angles to line of survey.

3. The 50-foot tape, used for measuring short distances.
4. The 6-ft. rule.

5. Plumb bob, used in chaining.

6. Level rod target, for high accuracy and long sight

distance.

7. Chaining pins, for temporarily marking locations.

8. Chain or tape, used for measuring.

9. Hatchet, used in setting guard stakes (a sledge is used

in setting grade stakes).

10. Range pole, for sighting in angular or linear measurements. 11. Tacks, for marking surveying points.

12. Flagging, to indicate stake locations.

13. Lenker self-reading rod used on surveys of ordinary pre

cision.

Taking a sight. The instrument man has set up the transit over a point previously established. To do this, he has set the tripod with the plumbbob hanging as nearly over the tack in the stake as possible, and then shifted the transit head to exact position over the tack. Normally, this task takes an experienced instrument man about 3 minutes. Then the transit telescope is focused and sighted on the range pole which is held by the rodman directly over the reference point in a vertical position.

having made all necessary adjustments to
ensure the proper horizontal angle, focuses
the transit telescope and "lines in" the chain-
man's plumbbob by signaling left or right
until the transit's vertical cross-hair coin-
cides with the plumbbob string. The hori-
zontal distance was determined by taking
the difference between the station of the
stake and the station at which the transit is
set up; the party chief normally does this
and the instrument man checks his figures.
The rodman holds the chain at an even foot
mark below the transit, and the chainman
reads the graduations to get the exact mea-
surement to the hundredth of a foot.
tape must be held level and at the proper
tension for exactness.

The

Picture No. 6