26.
To raise weight as[7] well and as forcibly with the drawing back of the Lever, as with the thrusting it[8] forwards; and by that means to lose no time in motion or strength. This I saw in the Arcenal at Venice.[9]
Footnotes
[7]so—for as.
[8]of it.
[9]at Venice in the arsenal.
[A to and fro Lever.] William Bourne offers the following as his 112th Device, “touching the making of engines to thrust from or pull to you with great force or strength.” He says, “And furthermore, you may make an engine to thrust from you or to pull unto you, to lift vp or to presse downe with great force, eyther to goe with wheeles as before is declared, or else to goe with skrewes or to goe with both, as to thrust open huge and strong gates, or else you taking good hold, to pull them open vnto you wards, and will make but little noyse in the doyng thereof, but you must be sure to set the engine fast, if to thrust from, to be strongly and well backed, and to pull to them it must be strongly bolstered before, sufficient to be of force to scrue the turne.”
The Venetian arrangement may be described, as shown in the annexed engraving, where A, B, C, is a frame, the two upright sides of which D E, are provided with a series of clicks, appearing in the drawing like the serrated edge of a saw, and each is so placed secured by a pin on which it moves, as always to incline to fall outwards. F, F, is a long lever, having a stout short cross bar in the centre, and is represented on the point of taking up on a click at a, while it leaves one on the opposite b, such being the to and fro motion required, thereby losing “no time in motion or strength.”
27.