6 Domestic Science 



true length of a piece of cloth is not that recorded by 

 the tape. This is of special importance where material 

 has to be cut out to fit, as in the case of window -blinds. 

 The writer knows of a case in which a large number 

 of windows were carefully measured by a skilled work- 

 man, and blinds made for them from his measurements. 

 When these were delivered it was found, on fixing them 

 up, that they were all about one inch too narrow. The 

 blind-maker had used in measuring out the blind-stuff 

 a 60-inch tape which was too short by If inches, while 

 the workman had used a two-foot boxwood rule with 

 a brass-bound edge which was, of course, a much more 

 accurate instrument. 



B 



TTT 



2 



Fig. 2. 



8. We will now show how to measure a short 

 distance accurately by means of such a scale as that 

 shown in Fig. 1. 



EXPERIMENT 1. With a finely-pointed pencil make 

 two small dots a few inches apart on a sheet of white 

 paper. Letter these dots A and B. 



Place the scale with the end mark on the inch 

 scale at A (see Fig. 2) and carefully adjust the edge 

 of the scale (which should be thin) so that the point B 

 just touches the edge as in the figure. In judging 

 whether A is exactly opposite the last division of the 

 scale, the eye should be placed vertically above the 

 point A f and in reading off the measurement at B, 



