A. DAIGGER & COMPANY, CHICAGO, U. S. A. 



Standard Penetrometer 

 1071 



1072 



1071 PENETROMETER, Standard, New York Testing Laboratory Type, for 



measuring the depth of penetration of a standard 

 needle into the material to be tested at 77 F. or 25 

 C. in 5 seconds of time under a 100 gram weight; 

 with standard clock reading in y 2 seconds and dial 

 graduated to 1/10 mm. A set of adjustable weights 

 is provided permitting the use of either 50 or 100 

 gram loads in addition to the standard of 100 grams. 



See "The Modern Asphalt Pavement" $75.00 



1071a PENETROMETER, Miniature, exactly similar to the above but one-half 



the size and specially designed for engineers' portable 

 use in making comparative tests, without clock 25.00 



HOYT'S ELECTRICAL PENETROMETER 



1072 HOYT'S An electrically operated, automatic instrument for determining the 



consistency of asphalt and similar substances by measuring the depth 

 to which a standard needle with a definite load will penetrate during 

 a definite period of time, at a given temperature. 



FOR THE STANDARD TEST THE LEFT PUSH BUTTON IS PRESSED. 

 This releases the needle with attached weight and penetration instantly takes place. 

 After a lapse of exactly five seconds the needle is automatically reclamped and penetra- 

 tion ceases. The depth of penetration is read directly from the dial, each division of 

 which corresponds to 0.1 mm. downward movement of the needle. 



FOR SPECIAL TESTS the instrument may be adjusted for any variation desired. 

 Either the 50, 100, 150, 200, 250, 300 or 350 gram test may be made with equal accuracy 

 and speed by a simple substitution of weights. The needle may be readily clamped or 

 released for special tests by means of a clutch. For periods of penetration other than 

 five seconds, the push button on the right may be used and any desired time may be 

 allowed for penetration, the period being controlled by the large minute dial at the top 

 of the instrument. 



DESCRIPTION The entire instrument is automatic and is operated by two 

 ordinary dry cells. It is enclosed in a mahogany case with glass sash, lock and key. 

 There is also a large drawer located in the base for keeping the testing pans, ther- 

 mometer and other accessories. 



ADVANTAGES 1st, produces uniform penetration tests; 2nd, controls the 

 duration of tests; 3rd, applies uniformity of penetration weights; 4th, eliminates vibra- 

 tion during operation; 5th, insures absence of personal equation. 



Price, complete $100.00 



1072a NEEDLES, A. S. T. M. Standard. Description: The needle for this test shall 

 be of cylindrical steel rod, 50.8 mm. (2 inches) long and having 

 a diameter of 1.016 mm. (.04 inch) and turned on one end to a 

 sharp point, having a taper of 6.35 mm. (.25 inch). 

 Price, each $1.00 



