The annexeJ engravings lire a side elevation [lijjure l') and a transverse elevation (figure 2) of a tiaiher sawing mine, constructed by Messrs. WoHisam is: Co., engincera, ol LOR-; don. WP have selected this from the London Artigar., knowing that a great number of our j readers are interested in sawing machinery, consequently they like to see and know how such machinery is arranged. constructed; and used in other countries beside our own. In arranging the building of a heavy timber frame, the louujations are ordinarily a heavy j item, from the great depth required by the, length of the connecting rod; and if this is [ curtailed, the evil is entailed oi sufficient trie- ' tion on the guides. Iii Hie case before us, the makers have sought to reduce the height of: the machine, liy making the connecting rod [ forked, so as to embrace the frame, to both , sides of which i* is attached at the points, A A. I To admit the vibration of the connecting rod, the guides are suitably overhung. In the guides themselves, attention has been; directed to diminish ihe friction, which, ins surfaces moving at such a high velocity, con- same a large proportion of the applied pow-: er. With this object, the hack ar.d front; guides are not both V-shaped, as usual, but whilst the woikiisg side is made so, the other side is made flat, and has a brags plate pressed i in contact with it by means oi" a steel spring,' set up by ailjii-stitig screws to the exact pitch ; to keep the frame i'rern chattering. ! The lower saw buckles are of S-shape, and hook on to a projecting feather on the frame.' They are set up sideways by a longitudinal screw, passing through all the distance pieces, but not through the saw buckles, so that any saw can be taken out in a tew minutes. The timber is prevented from rising, when the saws are entering, by the two legs, C C, which are screwed, (with double threads) into sockets hanging from one of the strong distance pieces, between the sides of the framing. When adjusted to the proper length, they can be fixed in position by set screws. Provision is made for setting the log transversely. The frames, D and E, on which the ends ot the log are carried, are fitted up in the slide-rest style, and can be shifted by the screws across the rack-bed. They are made to suit the varying widths of timber, by one of the arms, H, being made a fixture on the shaft, S, whilst the other slides on the shaft, and is moved by a screw, I, to give the requisite grip of the wood. A balance-Weight,T, facilitates the adjustment. The other end, D, is provided with set screws for the same purpose. The feeding-motion is as usual; the eccentric rod, N, taking on to a ratchet-wheel, foi1 the feed, and a strap between the riggers, 0, and P, giving the quick return motion for the rack. The London Artisan asks its readers to give some particulars about the indicated power required for saw frames. In America five horse-power is allotted for driving a large rip saw, and a large circular saw. Gang saws are noWr common in American saw mills j , but the common mode of working the recip- rocating saw, is nearly the same as that re-j presented above.. An engine of three horse' i power will drive one of these saws, but it is i best to leave a good margin of power as a ; surplus; it is more profitable to do this thai* ' to work an engine or water wheel up to its ; full indicated power. I The lumber (dressed timber) interests of the United States are greater than those of all the other countries in the world put together. Everything, therefore, connected with our saw mills is of importance if it is an improvement. Saws involve more expense than all the other parts of ,a saw mill, because i they are continually subject to wear, as they ; expend the whole power of the engine or water wheel upon the logs. The engine, wheel, frame, &c, can all be- built strong enough to endure without incessant repair, not so the saws; they are continually getting dull and have to be frequently sharpened, The more knotty and hard the lumber, the more wear there is of the saws ; how important then to have good saws—tools that do not require a continual rasping with the file. For a long time we received our best saws from England, but this is not the case now. Saws of all descriptions are now tempered on an entirely new principle, and by a new process—which possess qualities of a far superior order to those ever before made in any part of the world. In our next number we will describe this process by which said saws are tempered; it is patented and is the inven- tion ot Mr. Waterman, of Williamsburg, N. V This process makes saws of a superior temper, and it requires no heating oil baths, dipping in water, &c, as is the case with tempering steel tools by the common methods. The tempering of a saw is performed in an instant, and by a most simple operation, which cannot fail to surprise our readers