2. Plant to be Furnished by Contractor. The contractor must furnish the plant to do the work, except the gas posts, and is required within five months from date of execution of contract to furnish and erect and put in service, at its own cost, to the satisfaction of the city, all lanterns, burners and other appurtenances, contrivances and fixtures which are necessary to operate and maintain the said lamps, and thereupon the contractor shall forthwith proceed to do the lighting. The necessary equipment shall be placed upon such gas posts as may be furnished and from time to time indicated by the city. Said plant and all appurtenances so furnished by the contractor, except gas posts furnished by the city, shall remain its property and must be removed by it at the expiration of the contract at its own expense.

If, in the opinion of the city, the contractor does not exercise due diligence in the erection of said plant, or if the materials furnished therefor are not in accordance with sample submitted, the city may give the contractor notice in writing of such dereliction and then if the contractor fails within thirty days thereafter to obey any proper order of the city in connection with the work of erecting and furnishing the plant, the said commissioner, with the consent in writing of the Mayor, may declare the contract forfeited.

3. Lamp-posts. The posts on which the contractor is to place and operate its lanterns will be furnished by the city to the contractor free of expense. They shall be set and connected by the contractor in locations designated by the Commissioner of Public Works, shall be neatly painted such color as the city may designate, and shall be repainted from time to time whenever, in the opinion of the city, it shall be deemed necessary, and shall be kept in good repair and plumb by the contractor. The posts must be kept free from dirt and must not be used for advertising purposes.

The contractor must furnish cross arms and all fittings above the top of posts, as at present installed, on such posts as the city may designate.

It is understood that the service pipes now in use are to be furnished by the city in their present condition, and that breakage and leaks in said service pipes are to be repaired at the expense of the contractor. 4. Lanterns. The lanterns or equivalents must be of the form best adapted to the character and location of the lamp contracted for, and identical in con

struction with the sample lantern submitted. They must be so constructed that the lamps therein will be protected against insects and wind and weather. The height of the flame above the street level shall not be less than the average height for the same type of lamp now installed in the city.

5. Burners and Mantles. The burners to be used must be first-class in material and workmanship, furnishing at all times when in service a steady, clear white light, free from smoke, and of the required candle power. All broken, smoked, blackened, ragged or frayed mantles must be at once replaced with new mantles by the contractor.

If the lamps shall not give continuously the required candle power they must be replaced by the contractor with others satisfactory to the city.

6. Time of Lighting. All lamps must be lighted and extinguished in accordance with a schedule to be furnished by the city, said schedule not to exceed 4,000 burning hours per lamp per year. All lamps must be lighted within one hour from the time fixed in the schedule as the time for beginning, and must be extinguished within one hour from the time fixed in the schedule as the time for beginning to extinguish.

In order that the city may determine whether the lamps are lighted and extinguished in accordance with the official schedule hereinbefore mentioned, the contractor shall furnish the said official with maps or lists. showing the number and geographical location of each lamp in the district of each lamplighter, and designating the particular lamp at which each lamplighter commences to light and also the lamp at which he completes the lighting; and in extinguishing the lamps the lamplighter shall begin and finish at the same lamps as are designated for beginning and finishing points in any lamp district during the term of contract; or such other information as will show the city the time of lighting and extinguishing all of said lamps.

The lamplighter and other employees of the contractor will not be permitted to climb the lamp-posts for the purpose of lighting the lamps or for any other purpose, except by use of a ladder.

7. Candle Power. The lamps shall be maintained when in service at not less than sixty (60) horizontal candle power for single-burner lamps and one hundred (100) horizontal candle power for double-burner lamps.

The city may at any time, by written notice, require the contractor to employ a competent and disinterested

person connected with either the Massachusetts Institute of Technology or the Scientific Department of Harvard University, or such other person acceptable to both parties, to examine and test by standard laboratory methods, under conditions which duplicate as nearly as possible the lamps as they burn on the streets, the apparatus employed in furnishing the lighting service herein provided for, to ascertain whether or not the contractor is complying with the terms of this agreement, and for such purpose such person may have access at all reasonable times to the lamps, fixtures and other apparatus of the contractor used in carrying out this agreement. In case two tests of any lamp shall be made, separated by an interval of not less than one hour during any one night, and both of said tests shall prove that the contractor is not furnishing the light required by this agreement, then such lamp shall be deemed to be deficient, and a deduction shall be made from the charge in respect to such lamp as herein provided. If such tests show that the contractor is not furnishing the light required by this agreement, the contractor shall pay the expense of the examination and test provided for herein; otherwise the city shall pay such

expense.

For each lamp which shall be shown by the tests above specified to furnish less than 60 candle power for single-burner lamps and 100 candle power for double-burner lamps, but more than 30 candle power for single-burner lamps and 50 candle power for doubleburner lamps, a sum equal to 3 of the yearly contract price for such lamp for each night in which such deficiency occurs shall be deducted from the amounts due to the contractor. For each lamp found to give less than 30 candle power for single-burner lamps and 50 candle power for double-burner lamps, a sum equal to of the yearly contract price for such lamp for each night on which such deficiency occurs shall be deducted from the amounts due the contractor. For each lamp reported out by the Police Department at its respective police stations or by the officials of the Public Works Department, a sum equal to of the yearly contract price for such lamp for each night such failure occurs shall similarly be deducted from the amounts due the contractor. Such reports shall be made daily in writing, open to the contractor, and shall