copper rod extending from the top of the building to a 

 large metal plate buried in the ground. [21.] 

 Lightning Bod. A metallic rod or band in communication with 



a lightning conductor. 



Lime-Light. A block of lime rendered incandescent by an 

 oxy hydrogen blow-pipe or jet, used particularly as a magic- 

 lantern illuminant. [20, 26.] 

 Lind's Anemometer. See Anemometer. 



Line. A slender threadlike measuring tape or cord. [24, 27.] 

 Line, Masonry. The bricklayer's cord, which is his guide for 

 level and direction. 



Linear Micrometer. A graduated scale placed in the field of a 

 telescope and used to measure distances between objects. 

 [13, 18, 21, 25, 27.] 



Linen Prover. A simple microscope for counting the threads in 

 a given space of linen fabrics. [2, 5, 13, 15, 17, 20, 21, 22, 

 24, 25, 26.] 



Linseed Oil Thermometer. See Thermometer. [5, 13, 15, 16, 21.] 



Liquid Compass. Sec Compass. 



Lissajpu's Figures Apparatus. Apparatus for the analysis of the 

 vibrations of tuning forks. Light is reflected from a small 

 mirror attached to the tuning forks and the images thrown 

 on a suitable screen giving rise to the " Lissajou's Figures." 

 [19.] 



Lister's and Babcock's Centrifugal Machine. For milk analysis. 

 See Centrifuge. 



Lister's Inclinometer. See Inclinometer. [21.] 



Lister's Theodolite. See Theodolite. [13, 21.] 



Littrow Spectroscope. See Spectroscope. [14.] 



Litrameter. An instrument for ascertaining the sp. gr. of liquids. 



Live Box. An apparatus for holding living objects during 

 observation with the microscope. [2, 3, 17, 20, 21, 22, 26.] 



Live Trap. A special form of life-slide, for use with the micro- 

 scope. 



Livingstone Depth Gauge or Sea-Sounding Gauge. [15.] 



Loaf-Testing Thermometer. See Thermometer. [1, 5, 13, 16, 

 17, 21.] 



Locomotive Pyrometers. See Pyrometer. [4, 13, 17.] 



Log. An apparatus for measuring the rate of a ship's motion 

 through the water. [13, 15, 16, 17, 21, 28.] 



Log, Electric. A log (q.v.) in which the indications are trans- 

 mitted electrically to receiving instruments. [15.] 



Log-glass. A small sandglass used to time the running out of 

 a log line. [13, 15, 16, 17, 21, 28.] 



Log-line. A line to which the ship's log is attached. [13, 15, 

 16, 17, 21, 28.] 



Log-Log Duplex Slide-Rule. See Slide-Rule. 



H 2 



