6 9 



Chart Frame. A strongly-made frame, having a transparent top 

 with a pencilling surface in which the chart can be placed 

 and used on the deck or bridge of the ship. [13, 15, 16, 20, 

 28.-] 



Chartholder. A device for holding charts stretched out and flat 

 on the chart-table at sea. [28.] 



Chart Magnifier. See Magnifier. [2, 13, 15, 16, 20, 21, 27, 28.] 



Chartometer. An instrument for measuring distances on charts 

 and maps. [13, 15, 21, 27.] 



Chart Protractor. See Protractor. [13, 15, 16, 21, 28.] 



Chart Table. A frame or table with a transparent top in which 

 the chart can be used on a ship's bridge. See Chart Frame. 

 [13, 15, 16, 28.] 



Chart Weights. Lead weights, generally cased in leather, for 

 holding down a chart. [2, 13, 15, 17, 21, 27, 28.] 



Chattock Tilting Micromanometer. See Micromanometer. [4.] 



Cheilvangroscope. An apparatus to enable the circulation of the 

 blood to be examined. 



Chemical Balance. See Balance. [2, 5, 17, 20.] 



Chemical Thermometer. See Thermometer. [2, 5, 6, 15, 16, 17, 

 20, 21, 25.] 



Chemists' Slide-Rule. See Slide-Rule. [13, 24.] 



Chiragon. See Cecograph. 



Chlorometer. An instrument to test the decolourising or 

 bleaching powers of samples of chloride of lime. [25.] 



Chondrometer. A steelyard or balance for weighing grain. [5, 

 17, 21.] 



Chorograph. An instrument for constructing triangles in marine 

 surveying, etc. [15.] 



Chromascope. An instrument for showing the optical effects of 

 combining colours. [26.] 



Chromatometer. A scale for measuring the degrees of colour. 



Chromatoscope. A reflecting telescope, part of which is made to 

 rotate eccentrically so as to produce a ring like the image 

 of a star, instead of a point. Used in studying the scintilla- 

 tions of the stars. 



Chromatrope. An instrument for exhibiting certain chromatic 

 effects of light (depending upon the persistence of vision 

 and mixture of colours) by means of rapidly rotating discs 

 variously coloured. [20, 26.] 



Chromometer, Wilson's. An instrument for determining the 

 colour of petroleum. 



Chromoskop (Ives's). An instrument for viewing simultaneously 

 positives in three colours, producing a single positive in 

 natural colours. 



Chronograph. A time-indicator. Astronomical intervals are 

 noted by pressing a key, which makes one dot or puncture 

 on a travelling strip of paper at the commencement and 

 another at the end of the observation. The term is also 

 used to designate a form of stop-watch for measuring with 



