





WEIGHT VARIATION OF PACKAGE FOODS. 15 
TaBLE 10.—Claims made by automatic weighing machine manufacturers—Continued. 
Speed. 
Maker! nye . Accurac Capacit Products packed 
No. | “Pe: Packa Devices ; y- PAciey P : 
es per) for regu- 
ho res 
2 lating. 
' Ozs. Lbs 
5 D 600 | Several .| 100 per cent within 5 | Free-flowing materials, such 
ss ounce. aa bone rice, sugar, and 
salt. 
E 600) |S2cdoreess|22 322 GOs San ete 10 Do. 
F GOONS dome n | icke One ease 4 tol0 | Cohesive materials, such as 
; cocoa; will also handle tea. 
G 600 |...do....- INO(Claimaseete ee 1-8 Cocoa. Nota weighing ma- 
chine but sometimes used 
as such. 
6) A 1,200 | None....| 100 per cent within 4 to 23] Free-flowing materials, such 
ys ounce. as coffee, rice, tapioca, Salt, 
and sugar. 
B 1520042 dorsce-|oseee OCG RRR SEE ae eae 1 to 5 j; Ground spices, baking pow- 
der, rolled oats, flour, tea, 
ete. 
7 A SOO=ES100; Ee doses. a lsacl-= Mees Ieee 2 to 1 | Cocoa, baking powder, 
pround spices, tea, cereals, 
| etc. 
B 800-1, 100 |-..do....-|..:.- GORE eae cielcaeis 2 to 1 | Sugar, jelly powder, coffee, 
rice, ete. 
48; A 1,500-1,680 | Some. .-| 75 per cent absolute- 2 to 7 | All free-flowing materials, 
ly accurate; 100 such as Salt, sugar, coffee, 
per cent within farina, cereals, rice, cocoa, 
+s ounce. corn starch, etc. 
B PRO00= Ie S00 2d Ofssee se 2G One sachsen = 2 to 2 
C (PDE C I BaeG Oeeten| sane Cloaaoeaeeoeaess 1-15 


4 Other sizes up to 25-pound capacity are listed. 
The almost unanimous claim of one-sixteenth ounce “accuracy” 
on practically every size of package might seem extravagant. A 
wide range of speed is claimed for individual machines, and in some 
cases devices for regulating it are attached. In the absence of such 
devices, the regulation is made before the machine is set up. These 
machines have two essential parts in common, namely a scale, and 
a device for cutting off or diverting a stream of the product which 
falls on the scale pan. As a rule, the speed of packing is regulated 
by a device which controls the size of thestream. The manufacturers 
of machines seem to have recognized and several have stated that 
the impact of a large stream upon the scale pan is not conducive to 
accuracy. Apparently almost any desired accuracy could be ob-— 
tained if the cross section of the falling stream were made small 
enough. This view would indicate that the manufacturer’s claim 
for accuracy is not necessarily extravagant, provided the proper 
speed is maintained. This speed, however, may not be a practicable 
one. 
EXPERIMENTAL WORK ON MACHINES. 
A number of commercially operated machines were tested in order 
to determine the effect of various factors on accuracy, as well as their 
ability to meet the accuracy of hand weighing. Each machine was 
examined to make sure that it was in good repair. The operator 
