10071 5 grams
Tin Ore Cruc. and SnO_{2} 9.6065 grms.
Feb. 3/89 Cruc. and Ash 9.4235 "
------
SnO_{2} = 0.1830 = 2.88% Tin
______________________________________________________________

_The Assay Book._--This is the Official book, and is a combination of
the Sample and Laboratory books. It corresponds with the report-forms.
Without being loaded with detail, it should contain sufficient to
characterise each sample.

Key to following example page of Assay book:
DR = DATE REPORTED.
Not Det. = Not detected

EXAMPLE OF PAGE OF ASSAY BOOK.

-------------------------------------------+----+-------+---------------+----
DESCRIPTION OF SAMPLE. | | Water | Assay on |
------+--------------------+---------------| |Lost at| the Dry |
Date. | Material. | Weight. |No. |100∞ C.|Material. | DR
------+--------------------+---+---+---+---+----+-------+---------------+----
1889 | |ton|cwt|qrs|lbs| | | |
Feb. 1|Tough cake copper | | | | | 482| |Arsenic, 0.52% | 7
" |Tough cake copper | | | | |2082| |Arsenic, 0.63% | 7
" |Tough cake copper | | | | | 491| |Arsenic, 0.68% | 7
| | | | | | | | |
Feb. 2|Nickel disc for C.R.| | | | | X | |Copper, 73.75 | 7
| | | | | | | |Nickel, 24.34 |