12 THE PURCHASE OF COAL UNDER SPECIFICATIONS. 
In this connection it may be stated that all the available storage capacity of 
the coal bunkers will be placed at the disposal of the contractor to facilitate 
delivery of coal under favorable conditions. 
After verbal or written notice has been given to deliver coal under this con- 
tract, a further notice may be served in writing upon the contractor to make 
delivery of the coal so ordered within twenty-four hours after receipt of said 
second notice. 
Should the contractor, for any reason, fail to comply with the second request, 
the Government will be at liberty to buy coal in the open market, and to charge 
against the contractor any excess in price of coal so purchased over the contract 
price. 
SAMPLING. 
Samples of the coal delivered will be taken by a representative of the Govern- 
ment. 
In all cases where it is practicable, the coal will be sampled at the time it is 
being delivered to the building. In case of small deliveries, it may be necessary 
to take these samples from the yards or bins. The sample taken will in no case 
be less than the total of 100 pounds, to be selected proportionally from the 
lumps and fine coal, in order that it will in every respect truly represent the 
quantity of coal under consideration. 
In order to minimize the loss in the original moisture content the gross sam- 
ple will be pulverized as rapidly as possible until none of the fragments exceed 
one-half inch in diameter. The fine coal will then be mixed thoroughly and 
divided into four equal parts. Opposite quarters will be thrown out, and the 
remaining portions thoroughly mixed and again quartered, throwing out op- 
posite quarters as before. This process will be continued as rapidly as possible 
until the final sample is reduced to such amount that all of the final sample 
thus obtained will be contained in the shipping can or jar and sealed air-tight. 
The sample will then be forwarded to 
If desired by the coal contractor, permission will be given to him, or his rep- 
resentative, to be present and witness the quartering and preparation of the 
final sample to be forwarded to the Government laboratories. 
Immediately on receipt of the sample, it will be analyzed and tested by the 
Government, following the method adopted by the American Chemical Society, 
and using a bomb calorimeter. A copy of the result will be mailed to the con- 
tractor upon the completion thereof. 
CAUSES FOR REJECTION. 
A contract entered into under the terms of this specification sball not be 
binding if, as the result of a practical service test of reasonable duration, the 
coal fails to give satisfactory results owing to excessive clinkering or to a pro- 
hibitive amount of smoke. 
It is understood that the coal delivered during the year will be of the same 
character as that specified by the contractor. It should, therefore, be supplied, 
as nearly as possible, from the same mine or group of mines. 
Coal containing percentages of volatile matter, sulphur, and dust higher than 
the limits indicated on page 2 and coal containing a percentage of ash in excess 
of the maximum limits- indicated in the following table will be subject to rejec- 
tion. 
In the case of coal which has been delivered and used for trial, or which has 
been consumed or remains on the premises at the time of the determination of 
