While Fig. 110 gives some general idea of the proportion which American fire losses bear to the value of new building construction, the two fluctuating curves make it difficult for the reader to make an estimate of the percentage losses year by year. Fig. Ill supplements Fig. 110, and gives for each year the total values for new building construction and the total values of buildings destroyed by fire. Here the percentages of the fire loss are quite obvious when judged by the extent to whi'ch the black ink covers the shaded bar representing new building construction. Figures are given in each case for the reader who may care to work out the actual percentage ratios. It must not be assumed from the titles of Fig. 110 and Fig, 111 that the buildings destroyed by fire are the same buildings whose value is recorded in the charts as "new building construction." The rapid advance in the use of fireproof materials makes it likely that the fire losses were more largely from older buildings, built by methods which gave a structure less fireproof than the average for buildings put up in recent years.

Fig. 114 shows an error in curve plotting into, which it is very easy for an inexperienced person to slip. One vertical scale is relatively

5.00 5.30 6.00 6.30 7.00 7.30 8.00 8.30 9.00

P. M Time Monday, Maich 14, 1910 P. M.

Sam. L. NavMaJy, in J<mmal American Society of Mechanical Engineers

Fig. 112. Record of Test of a Steam Turbine of 10,000 Kw. Normal Rating at Plant of City Electric Company, San Francisco, California