6 
SHORT NOTES ON PROFESSIONAL SUBJECTS, 
Observations taken with this Telemeter on the 19 th Nov., 20th Nov., 
and 19 th Bee., 1866 . 
Measured 
distance, 
feet. 
Corrected readings 
divisions. 
> 
Measured 
distance, 
feet. 
Corrected readings, 
divisions. 
*1. E. 
+ 7 
*L E. 
+ 4 
*1. E. 
+ 6 
Mean. 
*1. E. 
+ 7 
*1. E. 
+ 4 
*1. E. 
+ 6 
Mean. 
60 
724 
726 
723-5 
724-5 
750 
60 
61 
60-5 
60-5 
100 
369 
369 
369 
369 
900 
52 
50-5 
51 
51 
150 
251 
252 
251 
251 
1050 
46 
44 
45-5 
45 
200 
192 
193 
194-5 
193 
1200 
42 
40-5 
41*5 
41 
250 
156 
157 
158 
157 
1350 
39 
•38 
38 
38 
300 
132 
131 
134-5 
132-5 
1500 
36 
36 
34-5 
35-5 
350 
115 
115 
115-5 
115 
1650 
34 
35 
33 
34 
400 
103 
103-5 
103 
103 
1800 
32 
33 
31 
32 
450 
94 
90-5 
92-5 
92 
1950 
31 
31 
31 
500 
84 
83 
84-5 
84 
2100 
29 
29 
29 
650 
77 
76 
78-5 
77 
2250 
28 
28 
28 
600 
72 
72 
72 
72 
4500 
21 
22 
21-5 
21-5 
* I. E.—Index error, as determined each day. 
Table of Readings and Corresponding Distances. 
Readings, 
divisions. 
Distances, 
feet. 
Readings, 
divisions. 
Distances, 
feet. 
Readings, 
divisions. 
Distances, 
feet. 
Readings, 
divisions. 
Distances, 
feet. 
Readings, 
divisions. 
Distances, 
feet. 
Readings, 
divisions. 
Distances, 
feet. 
369 
100 
260 
143 
150 
261 
88 
474 
66 
665 
44 
1111 
365 
101 
255 
147 
145 
272 
87 
480 
65 
678 
43 
1146 
360 
102 
250 
151 
140 
283 
86 
487 
64 
691 
42 
1186 
355 
103 
245 
154 
135 
294 
85 
494 
63 
704 
41 
1226 
350 
104 
240 
157 
130 
307 
84 
501 
62 
718 
40 
1270 
345 
106 
235 
161 
125 
320 
83 
508 
61 
732 
39 
1318 
340 
108 
230 
165 
120 
334 
82 
515 
60 
747 
38 
1367 
335 
110 
225 
168 
115 
350 
81 
523 
59 
762 
37 
1420 
330 
112 
220 
173 
110 
366 
80 
530 
68 
778 
36 
1482 
325 
114 
215 
177 
105 
386 
79 
538 
57 
795 
35 
1544 
320 
115 
210 
182 
100 
410 
78 
546 
56 
813 
34 
1612 
315 
117 
205 
187 
99 
415 
77 
554 
55 
832 
33 
1690 
310 
119 
200 
192 
98 
419 
76 
563 
64 
852 
32 
1778 
305 
121 
195 
197 
97 
424 
75 
572 
53 
872 
31 
1873 
300 
124 
190 
203 
96 
430 
74 
581 
52 
894 
30 
1984 
295 
126 
185 
209 
95 
435 
73 
690 
51 
916 
29 
2109 
290 
128 
180 
216 
94 
440 
72 
600 
50 
939 
28 
2250 
285 
130 
175 
223 
93 
446 
71 
610 
49 
964 
27 
2412 
280 
133 
170 
230 
92 
451 
70 
620 
48 
991 
26 
2600 
275 
135 
165 
237 
91 
457 
69 
631 
47 
1019 
25 
2816 
270 
138 
160 
244 
90 
462 
68 
642 
46 
1048 
24 
3075 
265 
140 
155 
252 
89 
468 
67 
653 
45 
1079 
23 
3417 
Note. —The table of readings is deduced from the three days observations. 
