BAIRD c\TATLOCK (LONDON) LTD. 



3060-3063 



Cathetometer, Horizontal or Vertical. 



3066 



This instrument has been specially designed for the use of students. It is strongly constructed, and not 

 easily deranged. It consists of a stout brass bar, cylindrical in section and straight, which swings between two 

 hardened steel centres, and can be clamped in any position in azimuth. A millimetre scale runs almost the entire 

 length of the bar. A carriage slides along the bar and is provided with a feather-way, spring, and clamp. One 

 face of the carriage is formed into a dovetail slide, along which for a convenient distance the telescope travels, 

 being actuated by a fine micrometer screw. The position of the telescope is read by means of a vernier attached 

 to the telescope support. The telescope has a focal length of about 7 in., and a clear aperture of f. an -d is 

 provided with level and cross wires, and is adjustable horizontally. It can be focussed from infinity to within 

 3 ft. The construction of the stand is such that the instrument can be used either vertically or horizontally. 



3060 s Cathetorneter, with 50 cm. range, reading to 0.02 mm. 



3061 s ,, I metre ,, 0.02 mm. 



3062 s ,, 50 cm. ,, .01 mm. 



3063 s ,, i metre 



3064 s Cathetorneter, as above, fitted with reversible telescope, with rack motion 



. . 7 10 ( 



.. 10 10 ( 



. . 8 10 ( 



.. 12 I 



extra 1 10 ( 



3066 1 Horizontal Reading Microscope. Price, including objective, eyepiece, and micrometer 5 



This instrument consists of a microscope tube placed horizontally on a column which may by a draw and rack 

 and pinion movement be extended from 34 to 55 centimetres. The column rises from a tripod base provided with 

 a level and levelling screws. A millimetre scale and a vernier indicate to rV millimetre the magnitude of vertical 

 displacements. The microscope tube carries a spirit level, and may thus be made to rotate in a strictly horizontal 

 plane by the adjustment of the levelling screws at the foot of the stand. The objective consists of two separable 

 doublets and gives three magnifications at 5, 9, and 48 centimetres focus respectively, rack and pinion adjust- 

 ment serves to focus the microscope tube. A micrometer, i centimetre long divided in too, in the diaphragm of 

 the eyepiece still further increases the utility of the instrument for fine and accurate measurements. 



CROSS STREET HATTOTST GARDETST, E-C 



580 



