298 forestry Quarterly. 



wire rope appears serviceable of a diameter of 2.5 mm. (.0984 

 inch) consisting of 42 fine wires, 6 strands, 7 wires to the strand, 

 with a hemp core, 300 feet long weighing about 4^ lbs. The sub- 

 divisions are noted by a small brass bullet soldered on, on which 

 the reading is impressed on a flattened part of the bullet. The 

 ends are treated like those of a steel tape with stout ring through 

 which a stretcher stick can be passed. The ring is connected 

 with the rope by a swivel. To the other end is attached a dyna- 

 mometer (apparently constructed on the principle of a spring 

 balance) provided also with a ring through which the stretcher 

 stick is passed. This dynamometer permits a constant stretch 

 for every measurement, the most satisfactory having been found 

 to be 20 Kg. 



The author has subjected this measure to careful tests and with 

 considerable mathematical apparatus determined its errors, and 

 has found that in regard to accuracy it lies between steel tape and 

 lath measurements. Due to its length the errors of laying the 

 measure on out of line and of frequency of laying on are reduced; 

 due to its lightness and the considerable and uniform stretch to 

 which it can be subjected (20 Kg) no kinking is experienced; 

 temperature influences are no more unfavorable than on other 

 measures ; topographic inequalities do not influence it, especially 

 when used with a clinometer. A long series of trial measure- 

 ments is given to show its accuracy. 



Die Ldngenmessung mit dem Drahtseil. Centralblatt f. d. g. Forstwesen. 

 March, 1912. Pp. 116-128. 



A map to be used in the management of a 



Forest Maps forest property should according to Dr. 



in Glaser possess the following qualifications : 



Germany. 1. Delineation of the topography; 2. The 



stand and type relations: 3. Clearness and 



comprehensiveness; 6. Ease of reproduction and durability. 



The contour interval in German forest maps varies from five to 

 twenty meters. Contours are considered necessary on account 

 of their value in delineating the forest types and in planning road 

 systems and cutting operations. The scale most commonly em- 

 ployed is 1 = 10,000. The kinds of roads and trails, the character 

 of ownership, and the location of villages, cultivated fields, and 

 points of aesthetic interest are shown in great detail. 



