HYPSOMETERS. 



No. 4402. 



No. 4404. 



No. 4400. 



4400. Hypsometer (after Klaussner). Brass, graduated surfaces 



silvered, in wooden box, 8 X 2f X 2f inches each |26 00 



This Hypsometer offers the advantage over most others that the total 

 height of the tree or other object can be read direct from one scale and that 

 it does not require the adding of the readings above and below the observer's 

 level. The weighted altitude-scale is much steadier in the wind than a plumbbob. 



This Hypsometer consists of a base rule (6 in. long), a hinged sighting 

 rule and an altitude-scale held vertical by a weight. The base rule is gradu- 

 ated up to 60 equal parts, each part divided to halves, forming the distance 

 scale. It carries a slide with reading line, to which the weighted altitude 

 scale is attached. The altitude-scale is graduated to 50 equal parts, each 

 part divided to halves. The graduations may be read as yards, meters, 

 feet or in any other unit, depending on the unit adopted in measuring the 

 base line (object to observer). The" slide of the altitude-scale is set on the 

 distance scale to correspond to the measured base line. The sighting rule is 

 hinged to the near end of the base rule, and, like the base rule, has a hair- 

 line siajht at its further end. At the joint of these two rules is a revoluble 

 peep sight, which can be directed to either of the two hairlines by a milled 

 disk. After sighting the base of the object along the base rule, the sighting 

 rule is raised by means of a high pitch thumbscrew, until its hairline cuts the 

 lop of the object. The instrument has a jointed ferrule with clamp screw 

 threaded to fit the regular photographer's tripod screw. 



4402. Support with Gimlet, for attaching to a tree or post, hard 



wood cross piece " each $ 1 00 



4404. Brass Ferrule, to fit the support with Gimlet, or Jacob Staff, 



or tripod 1 00 



For Jacob staff and Tripods see page 9. 



Tli is hypsometer is particularly adapted in eases where necessity of haste or the 

 roughness of country make the use of a tripod impracticable. The resul-ts obtained are 

 more accurate when using a tripod than without one. 



