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BAIRJD &TMLOCK (LONDON) LTD. 



3224 



3224 Demonstration Rod, i metre long, with one plain and the other three sides graduated into 



decimetre, centimetre, and millimetre, to illustrate the metric system . . each 036 



BAIRD 8. TAT LOCK (LONDON) U'. 



1 



4 3 



YAlRD 



3225 



3225 Copy of Standard Yard Measure, in boxwood, brass tipped, divided into inches, J, J, 



and Jj in. . . . . . . . . . . . . . . . . each 1 3 



3226 



3226 Boxwood Rule, 30 cm. long, with bevelled edges, divided into centimetres along one edge, 



and into inches and half inches along the other edge . . each, 4d. ; per doz. 



These rules are useful for practice in estimating tenths. Measurements made by estimate 

 can be checked by direct measurement with a scale divided into millimetres and tenths of 



an inch. 



Y\ \\ \ \ \ \ \ \-\ \ \-\ \ \ \ \ \ 



Section. 





3227 



3228 



3227 Boxwood Measures or Rules, 12 in. long, triangular section, graduated inches on one 



side in tenths and millimetres on other side .. .. each, 1/6; per doz. 17 ' 



3228 Steel Rule, folding, divided into inches and tenths on one edge, and into centimetres and 



millimetres on other edge . . . . - . . . i ft. long, 3 folds, each 1 



3229 Steel Rule, in leather case, for the pocket . . 



2 



CROSS STREET HATTOTST GARDE1ST, E-C 



612 



