coal trade bulletin - Clpdigital.org

36 THE COAL TRADE BULLETIN.
PROCEDURE FOR ESTABLISHING A LIST OF PERMISSIBLE PORTABLE
ELECTRIC MINE LAMPS*
An act of Congress (37 Stat., 681.) approved
Feb. 25, 1913, contains the following provision in
regard to tests or investigations performed by the
Bureau of Mines:
That for tests or investigations authorized by
the Secretary of the Interior under the provisions
of this act, other than those performed for the
government of the I'nited States, or state governments
within the United States, a reasonable fee
covering the necessary expenses shall be charged,
according to a schedule prepared by the director
of the Bureau of Mines and approved by the Secretary
of the Interior, who shall prescribe rules
and regulations under which such tests or investigations
may be made. All moneys received from
such sources shall be paid into the Treasury to
the credit of miscellaneous receipts.
The Bureau of Mines is making tests at its Pittsburgh
experiment station in the endeavor to establish
a list of permissible portable electric lamps
for use in gaseous mines. This schedule is issued
for the information and guidance of those who may
desire to submit lamp equipment for test. It
supersedes Schedule 5, issued under date of April
5, 1913.
The Bureau of Mines considers a portable electric
lamp to be permissible for use in gaseous
mines if all the details of the lamp's construction
are the same in all respects as those of tbe lamp
that passed the inspection and the tests made by
the bureau and hereinafter described.
The conditions under which the Bureau of
Mines will examine and test portable electric
lamps to establish their permissibility for use in
gaseous mines are as follows:
1. The tests will be made at the experiment
station of the Bureau of Mines at Pittsburgh, Pa.
2. Applications for tests shall be addressed to
the director, Bureau of Mines, Washington, D. C,
and shall be accompanied by a
COMPLETE DESCRIPTION
of the lamp to be tested and a full set of the
drawings mentioned below.
A drawing or drawings clearly showing the size
and general appearance of the lamp mounting;
A drawing or drawings clearly showing the
character, size and relative arrangement of the
parts of the lamp mounting, and the principle of
operation of the safety devices;
Any other drawings that may be necessary to
identify the safety devices or to explain how
they accomplish their purpose.
•Schedule 6, U. S. Bureau o£ Mines.
A copy of the description, a duplicate set of
ihe drawings, and one complete lamp shall be
sent to the electrical engineer, Bureau of Mines.
Fortieth and Butler streets, Pittsburgh, Pa.
3. As soon as possible after the receipt of his
application for test the lamp manufacturer will
be notified of the date on which his lamps will
be tested and the amount of material that it will
be necessary for him to submit.
4. All material for test shall be delivered by
the manufacturer to the electrical engineer, Bureau
of Mines, Fortieth and Butler streets, Pittsburgh,
Pa., not less than one week prior to the
date set for the test.
5. No lamp equipment will be tested unless it
is in the completed form in which it is to be put
on the market.
6. Lamps so constructed that they can be used
both as cap lamps and as hand lamps must pass
the tests for both cap lamps and hand lamps or
they will not be approved for either class of service.
7. No one is to be present at these tests except
the necessary government officers, their assistants,
and one representative of the manufacturer of
the lamp to be tested.
S. The conduct of tbe tests shall be entirely in
the hands of the bureau's engineer in charge of
the investigation. The tests will be carried on
in accordance with a
PREDETERMINED SCHEDUI.E.
which may be examined and discussed before the
tests by the representative of the lamp manufacturer,
who shall, however, be present at the tests
only in the capacity of an observer. While the
tests are in progress the manufacturer's representative
shall not make unsolicited suggestions
or criticisms of the method of conducting the test,
9. The tests will be made in the order of the
receipt of application for test, provided that the
necessary lamp equipment is submitted at the
proper time.
10. The details of the results of the tests shall
be regarded as confidential by all present at the
tests and shall not be made public in any way
prior to their official publication by the Bureau of
Mines.
The requirements that a portable electric lamp
equipment must have, to pass successfully the inspection
and tests required by the bureau, are
stated below.
1. The lamp equipment must comply w-ith the
following requirements for mechanical and electrical
construction: