W. & L. E. GURLEY, TROY, N. Y. SIMPLICITY and sturdy construction of BUFFALO SUSPENSION BEARING RAILROAD TRACK SCALES with compression connections are perhaps the qualities that first attract the Scale Engineer and User. There are many others. We will gladly tell you about Buffalo Scale Company, Inc. BUFFALO, N. Y. T HE reaction which prevails in the civilized world after four years and more of war is certain to assert itself in varying forms of unrest. Today, we know that Europe is being swept by the fires of socialism. We know that this form of radicalism cannot be confined to foreign shores any more than it was possible to prevent the epidemic of influenza from reaching our country. Therefore, the question is not how to keep it out, for that cannot be done, but how to cope with it when it does No specific rules, regulations or courses can be defined or outlined, but there are certain principles upon which we may proceed safely. The first one is this: Remember that the U. S. A. has had its troubles from the foundation of the Republic to the present, but it has always successfully overcome those troubles. The American people can be trusted to intelligently handle all internal problems. That is what every bona fide American believes. Therefore, if as individuals, we take a generous view of the social unrest which prevails. in other countries and which is certain to prevail here, being wise in what we say privately as well as publicly, advocating at every turn co-operation between contending factions such as Capital and Labor, whose interests appear to be diametrically opposed to each other, but which in reality are entirely mutual, then we shall help to solve one of the great big problems of reconstruction. Personally, we ought to put just as much service as is humanly possible into every working day and then when we have done that, we ought to smile, for a nation of laughers is a nation of eternal livers. Merry Christmas! $2.00 Per Year. New Richardson Self-Compensating-Type Registering are more than mere labor-saving machines To the country shipper they are fellow The weights obtained on a hopper scale or semi-automatic are always at the mercy of the operator's interest or care. Weights obtained on the NEW RICHARDSON are so hedged with mechanical safeguards as to convince any honest skeptic. The Richardson Safety Interlock prevents the feed and discharge gates being open at the same time. No grain can pass through unweighed. The two counters checking each other make errors in recording impossible as it is incredible that they should both go wrong at the same time in the same way. The ticket printing device prevents errors in writing the weights down. And-the NEW RICHARDSON makes its own adjustments for differing gravities of the grain being weighed or rates of flow. Three prolific sources of error in hand weighing and almost the only source of error in semi-automatic weighing are forever eliminated. The NEW RICHARDSON is the only truly automatic scale. It is the only scale that replaces the man and his errors. Richardson Scale Company PASSAIC, N. J. Scale Journal Vol. 5. No. 3. CHICAGO, DECEMBER 10, 1918. $2.00 Per Year PART 2. of great interest is the review of a modern 150-ton beam applied to railroad track scales without loose weight, but with roller-poise to indicate full capaety as seen in Fig. 4. In general follows this examination the same course as absolved with the commercial scale No. 1212 in a former issue, and meets the variation of type and design from following data. A. Weight of beam with poise, balance ball complete, but less loops 131 lbs. B. Weight at beam rod to be determined. C Weight of back balance by which the beam is balanced 134 lbs. inclusive loop and hanger. m. The distance from fulcrum to beam rod 41⁄2 inches. The distance from fulcrum to back balance-pivot 16.2 inches. To obtain exact results, these weights and measures should be taken to a fraction of 1/100 lb. and inch, yet for demonstration above values will be satisfactory From these four known data, the calculation of the moment of inertia and all deductions hereafter are made. Since the beam is heavy and not readily handied, the location of the center of gravity upon triangular bearing is dispensed with and the center is attained by calcula tion as per formula (6) with reference to the here present conditions. d = 134 x 16.2/131 16.57 inches. This is undoubtedly a quicker method and more accurate for the purpose. The location of this center of gravity permits the formation of the moment of inertia for a beam suspended in "c" without any weight at "a" only loaded at al. See Fig 5. Oscillations In Scales By EUGENE MOTCHMAN Mechanical Engineer Standard Scale & Supply Co., Pittsburgh, Pa. It is clear that this beam with poise at zero (0) has the common center of gravity of the combination in the point h, the distance "d" from rotation center c. The first item in the moment of inertia is therefore Ad' 35967.36 lb.", the second term the acting back balance Cm2 about center C 35166.96 lb." and last term contains the entire mass (A + C) d'or Md' equal 72758.40 lb."". ming these three items: (15) I Ad'+ Cm' + Md'. I Sum 143892.72 lb. inches squared. Line 1: The deduction to square of radius of gyration, radius of oscillation and time in seconds for one beat are stated to enable comparison with other conditions to which such beam may be put. When this beam is vibrating without back balance at "al," the pull from scale and platform alone can be obtained from the heft set up by back balance, divided by the distance from beam rod to fulcrum 134 × 16.2/4.5 = 482.4 lbs., the force which has the same effect at "a" as C at "al." By this change of weight the moment of inertia is increased over that in line 1. (16) I Ad2 + Bf2 + Md'. I=214151.46 lb. inches. Line 2: In Table shows other functions, note the rapid decrease of time, when the balancing is performed at a point closer to fulcrum, it creates a shorter radius of oscillation and hence quicker beats. Such condition, having all weight at the beam rod, is rather abnormal, in most cases it is found that a combination exists. Assume Cl 80 lb. back balance at al, than will be the additional pull at "a." lb. (17) B Cm- Clm/f. B2170.8 1296./4.5 Illustration Fig. 4. = 194.18 The moment of inertia for the beam with poise at zero with this distribution becomes: (18) I = Ad2 + Bf2 + Clm2 + Md'. I = 171640.92 lb. inches'. In line 3: The comparative data appear for the same beam as they may be found in scales when installed. Actual test gave an average of 7% seconds for such a beam to pass from top to bottom of trig loop. The scale to which this beam was attached, is a 150-ton capacity 50 ft. weigh rail to A. R. A. specification with rigid deck. From the close check in period of vibration, the increase by friction is astoundingly small. A close scrutiny of the table will teach how to obtain a fast oscillating beam (line 2). how to avoid a slow one (line 1) and probably adopt the medium line 3. Since the moments of inertia are of varying magnitude, by reason of the influencing distances and loads the radius of oscillation in column d also changes. Yet in line 1, the greatest "r" will be found and should caution the designer to not provide an excessive distance "m" with a great load at "al." By this hefty weight (134 lb.) at same distance as in line 3, the increase in time of vibration is caused and not by the aggregate mass (M) alone. The distances in Fig. 5 apply to line 3, the loads CB, A and M agree with table. A repetition of the formulae to obtain the radii of gyration and oscillation is avoided as they are the same and prove the correctness in an application of such great difference, namely in a scale of 300 lb. as well as 300,000 lb. capacity. The co-incidence of time for the true length of the pendulum on the radius of oscillation about center "o" over the dis tance "e" to center of gravity h, is demonstrated from the moment of in. ertia: (19) Ad' + Bf2 + Cm' + Me'. Io = 93141 34 lb. inches squared, whence (14) t -'pl. (ko'/cg)*. Answer: t 5.52 Seconds, which is the same period of oscillation as in line 3 Fig. 6 with the same beam and load. ing, vibrating about pivot c. |