ANOVA showed a significant difference in mean damage ranking between the different treatments: the treatments with no abrader
(Treatments 1, 2, and 3) were significantly lower than all treatments with abrader
; Treatment 7 was significantly higher than all other treatment means; Treatments 4-7 were all significantly different from each other, with the damage at each of these treatments increasing from Treatment 4 to 7.
Table 1--experimental settings for the angle abrader
Positions Abrasion Normal Slip on angle classification load(N) angle abrader
([degrees]) 4,8 Low 20 2 severity 2,6 Medium 38 6 severity 1,5 High 61 12 severity 3,7 Ultra high 123 16 Severity Positions Surface Distance Time on angle velocity (m) of each (minutes) abrader
(km/ measurement of each hour) measurement 4,8 8.
The SiC abrader
seems to correlate strongly with field performance of rubber compounds in mill furniture.
With this precision speed control and encoder feedback, the DIN abrader
is said to deliver consistent results, insuring quality production, allowing supplier comparison and verifying advertised claims.
Classic DIN abraders
are available, as well as the SP abrader
and a glass run abrader
Adams, a research archaeologist, details the analysis of ground stone tools like mortars and pestles, manos and metates, abraders
, polishers, and hammerstones, and artifacts shaped by abrasion or pecking, such as axes, pipes, figurines, ornaments, and architectural pieces, as well as other artifacts like stones used in cooking and heating, structural stones, and ecofacts.
Material from Aganoa and To'aga indicated that a variety of tools--including abraders
, fishhooks and scrapers--were made from shell.
These whetstones differ from more common abraders
(n = 529), which are made of much coarser-grained sandstone and have four to six grinding facets (Harp, 1964:Plate 20:2).
Several sandstone abraders
, pieces of a very abrasive red sandstone, that were ground square on one edge.
Accordingly, the bones and teeth of bison, canids, deer, moose, wapiti, pronghorn antelope, fisher and badger, plus chipped stone scrapers, knives and perforators, and bone fleshing tools, abraders
and awls are found in archaeological sites of all periods across the Northern Great Plains (cf.
that prepare the surface of panels to hold a secure bond.
Other Ocean Bay implements included abraders
, scrapers, ocher grinders, and pecked stone lamps for burning sea-mammal oil.