16 BULLETIN 897, U. S. DEPARTMENT OF AGRICULTURE. 
was requested to adjust it carefully by his usual method and pack 
50 packages. His true aim was worked out as carefully as possible, 
eliminating scale errors, his speed of packing taken, and the 50 
packages accurately rewerened: 
TaBLE 11.—Variations in weight of different sizes and of different products packed by 





machine. 
Average 
deviation 
Make of Declared CRs 
Experiment No. Sarto! Product. weisht. Speed. packages 
average 
weight. 
Pkgs. per 
Ounces, hour. 
SCORES Ree oer Sacer ee SAE cea | 23 PR eDPerees- scene eers = 1, 680 0.049 
RoHS D. Cis tate BBE ea ae uaa HNC e aan 74 Aone QO edhe ico |e eas ee 034 
ESAS Ee ie ey Ss AU Male ee ct ig Seat gn Poe aoe GOs aes eee eee 4 Q) 039 
sy Dae SONG mse Vai a SI 2; (aes doscts 2 ee ee 4 2,118 042 
AN ETAGC 552s en ek a ean 041 
BG 2 ixeee apo RIS rR Ee ances Re it, | BCOCOR Naan ee ere eee 1.6 947 041 
7 Es SRS eR es SEE EE Ny cls ee ae Chalk ects GOS ae ee sil ees StS 032 
Pounds 
SO 2yee seein ak ee a (fal ee ee CoCo een pe 563 2.211 
50) OVA es eRe ee Oe a nS oc ey SN eet (ilssesa Goo eee eee 1 622 2,322 
BASVICTA SO ate cis Feast aN on em eee eee 037 
ER eae ati Pan a RET Er I: a Sal RICe eke aes ee yea i 2, 100 . 047 
SOU Seer ee esac ene aeeee a nemo Si | vee ONGE eee aes 2.5 1, 500 074 
ANVEN ASOT Fuso 5 cs ceie esis eee ree eee 3 047 



1 Speed lost, but slower than 853z. 
2 The container was apparently too small, as a quantity of cocoa was spilled in packing after the proper 
amount had been weighed out by the machine. These results are not included in the average. 
3 Average deviation ‘of 24-pound packages omitted from averages. 
The data taken to show the variation in accuracy due to packing 
different sizes of the same product on the same machine and that due 
to packing different products are given in Table 11. 
With the exception of the two sets of data in which the product was 
carelessly spilled, very little change of average deviation is noted as 
the declared weights increase to 1 pound. Neither is any appreciable 
difference in the averages of the various products noted. The average 
deviations increase in the following order, namely, cocoa, pepper, 
rice. The apparent and claimed difficulties in packing the products 
indicate the reverse order. Numerous ingenious tamping, packing, 
and stirring attachments which were rendering valuable assistance in 
the reduction of average deviations were found in use. These facts 
indicate that the machine manufacturer is successfully meeting the 
difficulties due to the peculiar nature of the various products. 
The data taken to show the effect of speed on accuracy and the 
possibility of meeting the errors of commercial hand weighing by 
machines are given in Table 12. 
Each group represents data taken on a single machine, all condi- 
tions being the same exceptspeed. Each declared weight is 1 pound, 
except in the case of experiments 856x and 856y, where 12-ounce 
packages were taken. Since the machine was reset for each speed, 
the results in column 5 indicate the possible accuracy in setting. 

a 
x 
