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Full text of "Modern Mechanical Engineering Vol-I"

8

DRAWING-OFFICE ORGANIZATION

Material Charts.—Material charts on squared paper should be kept
in the estimating office, and the day-to-day fluctuations marked thereon.
Each chart should extend for a quarter- or half-year, but when taken down
it should be carefully filed, as, over and above the market fluctuations, it will
be found that there are general seasonal fluctuations which it may be advis-
able to take account of in fresh work.

The material charts shown are completed for a full year. It will be
understood that this curve will be gradually traced either by noting daily

TIN ( English   Ingots)

£per ton
 120 115 110 105 100 95 90 85 80 75 70
	JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SER   OCT. NOV.   DEC.
											
	
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£per ton
 400
 380 360 340 320 300 280 260 240 220 200
	JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SER OCT. NOV. DEC.
											
	
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IRON

or weekly fluctuations. As a rule,
the curve is what is commonly
called a step curve, as shown for
iron, and is generally marked by a
clerk, who watches the markets
from day to day and observes the
current quotations. Notes of special
circumstances may be shown in
the margin. It will be known from
the data-books how much percen-
tage of these metals enters into total
weights, the amount that must be
credited to workmanship per ton of
metal bought, &c., so that the intelli-
gent use of the charts may bring an estimate out reasonably close to actual
results.

On Charges and Profits.—The last two items in the estimator's
calculations do not call for any special remark, that is the addition of over-
head or running charges and profit. These are generally fixed percentages
which are under the direct control of the management. These percentages
may be whittled down considerably to gain contracts in a strong competitive
market, or even done without, if it should seem advisable, in a period of
depressed trade. It may be better to keep the machinery running, even

Per -ton
 250/-
	JAN. FEB. MAR.APR. M/V JUNE JULY AUG. SEft OCT.  NCV. DEC
											
	
	
	
	
	
	
	
	
	
	
	
	

	
	
	
	
	
	
	
	
	
	
	
	

	
	
	
	
	
	
	
	
	
	
	
	

240/ 230/-22O.A
	
	
	
	
	
	
	
	
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2IO/-200/ I9ty-i«r>/.
	
	
	
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Fig. 2.—Cost Charts of Material