Miscellaneous Notices. 
13 
1830.] 
August, 1829. 
Sept. 1829. 
Oct. 1829. 
Nov. 1829. 
Sunrise, .... 
84 
76 
1 80 
81 
70 
754 
74 
514 
62| 
60 
41 
504 
Noon, 
98 
79 
884 
99 
74 
864 
96 
86 
91 
89 
76 
824 
Sunset, 
89 
76 
874 
90 
83 
8«4 
85 
75 
80 
78 
66 
Dfec. 1829. 
Jan. 
1830. 
Feb 
1830. 
March, 1830. 
Sunrise, .... 
54 
31 
424 
48 
28 
38 
64 
i 48 
1 56 
71 
1 43 
57 
N oon, ...... 
80 
68 
74' ‘ 
80 
70 
75 
86 
59 
724 
92 
72 
87 
Sunset, 
64 
59 
62 
not observed. 
not observed. 
not observed. 
IX . — Miscellaneous Notices. 
1 . Description of a Circular Saw, worked by the Foot • 
Tim machine is one, the adoption of which in every works -hop, we cannot too 
strongly recommend. It is fixed on a wooden frame, resembling a turning lathe, 
and is worked with ease by one person, who presents the wood to be cut to the 
teeth of the saw, which he, at the same time, turns by the action of his foot on a 
treadle. The axis on which the saw is fixed, is mounted on two puppets moving in 
a groove ; and it receives its rotatory movement by means of two bevilled wheels 
with grooves of sizes, one of which is fixed on the axis of the saw, and the other 
communicates with the treadle, by means of a bent axis and crank, in the usual 
manner. The saw turns in a trough, which receives the sawdust, and which, when 
full, is emptied. The upper part of the saw passes through a slit, cut in a piece of 
wood, which turns by a joint on the back part of the trough, with which it forms 
an angle, which may be varied at pleasure, by means of a regulating screw, so as to 
confine the action of the saw to that part which is supposed to be sufficient to cut 
tlie wood presented to it on the inclined rest. The dimensions to be given to a 
piece of wood cut by this machine, are regulated, by a parallelogram of brass at- 
tached to this rest or table, and also moving on a hinge, in such a manner that the 
longer sides of the parallelogram are parallel to the slit in the rest, in which the 
saw turns. By opening or shutting more or less this parallelogram, which is effect- 
ed by screws, and by applying the face of the piece of wood to be cut against its side, 
the desired dimensions are ensured. On the same table or rest is fixed a brass 
ruler in a groove, carryinga semicircle, divided into degrees like a protractor; this 
semicircle has at its centre a raised edge, which forms the guide to which the piece 
of -wood is to he applied when it is desirable to cut it at any angle. 
With the assistance of this machine we may prepare fiat squares, cubes, rec- 
tangular pieces, parallelograms of any angle, all of a perfectly regular shape ; it is 
even competent to cut tenons or grooves and tongues. In this case it is only 
necessary to regulate the small table rest and its parallelogram, which is easily done 
by the help of the several finger screws. 
This method of sawing has a great advantage over the ordinary one, when the 
pieces to be cut are of suitable dimensions. Time is saved, and an inexpert work- 
man is enabled to produce specimens of as good workmanship as the most practis- 
ed mechanic could without this assistance. — ltev.Ency . T. iii. y. 253. 
2. Explanation of Plates VII. and VIII. in Vol. /• of the Gleanings . 
The following explanation of two of our Plates, in the first volume, was mislaid at 
the time of the title page and index to the volume going to press. It is here 
printed for the information of those who are interested in the subject. 
PLATE VII. 
Fig* 1. Unio. B. 
Fig. 2 and 3. FJuviatile Area. 
Fig. 4. Anodonta ? B. 
Fig. 5. Melania, D. 
Fig. 6. Alelania, C. 
Fig. 7. Melania, A. 
Fig. 8. Melania, B. [viewed underneath. 
Fig. 9* The same with the animal, a. the disk or foot and head, 
PLATE VIII. 
Fig. 1. Ampullaria, A. 
Fig. 2. Animal of Ditto, B. 
