314 



KEW EXGLAXD TREES IX WIXTER. 



from a (lif^tauee c(jiial to several times tlie k'li.ulli of tlie tree, the 

 ]iei,t;-lit of a 10 ft. pole lieside the tniiik or a mark on the tiatuk 

 of kiio-\vn lieight may lie eompared \\-illi tlie heiu'ht of the whole 

 tree. Instruments for more aeeurati' measui-ement are on the 

 market under the name of hvpsometers. A home-made instru- 

 ment may readily lie constructed which has heeii found to compare 

 favorahly in accuracy witli the expensive Fanstmann hypsometer 

 of -which it is a modification. A rectangular Iward aljout a foot 

 in length is rtiled in S(|uares or more conveniently has S(|uared 

 coordinate paper jiasted on one side (fig. 1). Care should he 



Fig. 1. Home-made Heiyht ileasiii-er. 



observed that tlir top o[ the Iniard AF is straight aiul accurately 

 parallel to the lines running lengtliwise of the paper. The line 

 M( ' is numliered IVom i[ in any convenient unit. sa\- tip to 100, 

 and using the same unit, the line IIK is nuiidiered in l.iotli direc- 



