No. 51402. 



Measurement of Lengths. 



223 



51459. 1:1. 



51458. 1 : 1. 



51460. 1:2. 



51461. 1 : 5. 



51,448. Vertical Rule for placing on wall (as suggested by F. C. G. Miiller: M. T., p. 23), with 

 projecting end plate and spring cursor 



51.450. Measuring Staff, 3 m in length (M. T., p. 24) 



51.451. Tape Measure, 20 m long, with metre and inch graduation, in leather case, with 

 turn-in handle 



51.452. Indicator Cylinder (Miiller's), Figure, for the magnification of small variations in 



length (M. T., Fig. 4) 



51.453. Curvimeter, Figure, for measuring the length of curved lines, with 3 graduations 

 for scales of 1 : 15,000, 1 : 25,000 and 1 : 35,000, or with other graduations if required 



51.454. Pedometer, watch form, nickelled, counting to 100,000 steps, with press-knob zero 

 fly-back action, with 3 dials . 



51.455. Wire Gauge, Figure, for wires from 0.01 to 1 mm diameter 



51.456. Hole Gauge for cylindrical holes from 1 15 mm 



51.457. Vernier Caliper, Figure, with vernier for the millimetre graduation, also with 

 graduations in Khenish, English and Paris inches 



51.458. Micrometer Gauge (Palmer's) (M. P. I, Fig. 52) for measuring thickness of wires, 

 sheets and the like, Figure, 15 mm span, measuring accurately to 0.01 mm, with 

 feeler screw which secures that always just the same pressure may be exerted. In case 



51.459. - - idem, without feeler screw, nickelled, Figure, span 10 mm, reading 0.05 mm 



51.460. Small Spherometer, Figure, with magnifying glass and black plate glass . . . 



51.461. Spherometer (W. & E. phys. Prakt. Fig. 17), Figure, with micrometer screw of 

 0.5 mm pitch and head circle graduated in 500 parts, accurately measuring to 0.001 mm, 

 with plate, glass base 



51.462. - - idem, with feeler lever 



s. d. 

 15. 



7. 

 12. 



5. 



8. 



15. 

 5. 

 2. 6 



0. 7. 6 



12. 



5. 6 



10. 



5. 

 15. 



CI. WH, 419, 

 46H2, 5391. 



