no 



Jam-Boiling Thermometer. See Thermometer. [5, 6, 13, 15, 



16, 17, 21, 26.] 



James Submarine Sentry. See Submarine Sentry. [13, 15, 17, 28.] 

 Jamin Refractometer. See Refractometer. 

 Jaurus Marine Recorder. 

 Joint Pliers. A pair of pliers adapted for securing the joints ot 



compasses and similar instruments. [6, 15.] 

 Jointed Microscope. See Microscope. [2, 13, 21, 26.] 

 Joly's Balance. See Balance. 

 Joist Scale. This scale is a combined, direct, and a bisecting 



scale for setting out, opening, etc., from their centres. It 



is used to mark off joists or rafters in brickwork. [15, 21, 24.] 

 Jordan Barometer. A glycerine barometer (q.v.). 

 Jumper Stay Compass. See Compass. [13, 28.] 



Ealeidophone. An instrument consisting of a reflecting knob 

 at the end of a vibrating rod or thin plate, for making 

 visible, in the motion of a point of light reflected from the 

 knob, the paths or curves corresponding with the musical 

 notes produced by the vibrations. 



Kaleidoscope. An instrument which contains loose fragments 

 of coloured glass, etc., and reflecting surfaces so arranged 

 that changes of position exhibit its contents in an endless 

 variety of beautiful colours and symmetrical forms. See 

 also Polygonoscope. [2, 20, 26.] 



Eater's Reversible Compound Pendulum. See Pendulum. 



Kathetometer. See Cathetometer. [2, 3, 4, 13, 25.] 



Kellner Eyepiece. See Eyepiece. [2, 3. 10, 20, 22, 23, 26, 27.] 



Kelvin Deflector. See Deflector. [16.] 



Kelvin Dip Needle. A special form of dip-needle (q.v.}. [16.] 



Keratometer. An optical instrument for measuring by reflection 

 the curvature of the cornea of the eye in all meridians. [2, 

 3, 13, 21, 26.] 



Keratometer, Sutcliffe Self-Recording. An improved form of 

 direct reading keratometer, in which the astigmatic error of 

 the cornea is given in dioptrics. [17, 21, 26.] 



Keratoscope. An instrument for the examination of the eye in 

 cases of cataract. [26.] 



Kerotome. A surgical instrument for dividing the cornea in 

 operations for cataract. [6, 26.] 



Kew Magnetometer. See Magnetometer. [15.] 



Kew Pattern Barometer. See Barometer. [5, 13, 15, 17, 21, 27.] 



Kinematograph. See Cinematograph. [3, 8.] 



Kinescope (Kinetoscope). An instrument for producing curves 

 by the combinations of circular movements. 



Kinetic Energy Apparatus. As designed by Mr. A. P. McMullen, 

 R.N. College, Dartmouth. 



Kite Balloon Winch-Indicator. To indicate the speed in feet 

 per minute at which the cable is wound out and in ; also 

 the total length of cable out. 



