Plate X. Percussion Pendulum, from J. A. Nollet, Leçons de physique expérimentale,
6th édition (Paris, 1764), i, leçon 4, vii (see Cat. 53)
M E C H A N I C A L M O D E L S
63 CAPSTAN i 79i (25) Fig. 60
By Jochem Cats, Amsterdam
Signed: Mr I. Gats 1791
Baseboard 590 x 130, overall height 150.
Construction of mahogany and boxwood. The capstan drive operates directly one
winding drum, and a gear transfers the drive to a second drum. The account from
Cats, dated 15 October 1791, lists “ een Kaapstaan met twee rollen/25” .
Musschenbroek|f76%|;VII, fig. 3; Utrecht (1968) M77.
Ini. 6jj
64 CAPSTAN « i8 th C . (24J Fig. 61
Platform 260 x 260, overall height 325.
A model of a capstan with two catch-locks to the shaft under the platform. The
construction is of mahogany and boxwood. --
On his account for 1789, P. J. Honoré notes for 12 December the repair of a
mahogany capstan at a cost off 1—8—0. This model was probably bought in Amsterdam
at the auction on 18-19 November, 1789, of the instruments of Dr. Bosch (MV).
Inv. 6/4
65 HOIST or GIN 1791 (33) Fig. 62
By Jochem Cats, Amsterdam
Distance between front legs 34°> overall height 500; lead weight marked 8 oz. (235
grams);.
A model of a simple tripod hoist with windlass, constructed of mahogany and boxwood.
A weight is lifted via a pulley block, the winding cord being attached to the frame.
At the top is a single pulley, over which passes a cord from the pulley block to the
loacjfflj One of the windlass lever arms is missing. The account from Cats, dated 15
October, 1791, lists “ een bok met een ongelyke rol ƒ 25” . Bok or hijschtoestel translates
into English as gin or derrick.
Musschenbroek (1762) VII, fig. 4; Van Swinden (1786) i, book 3, fig. 40.
Inv. Gjgv