Account 1

In Treasury Papers 6050/1833
Charles Babbage Esq^re
D^r To Joseph Clement of Southwark
To a Machine for Calculating consisting of the undermentioned Materials as far as finished up to the 29th December 1832
To smooth planing five long framing plates for sixth difference Axis, Caps fitted in and fixed by two Screws for retaining the intermediate Axis.
To smooth planing four long framing plates for Snail Axis, Caps fitted in and fixed by two screws for retaining Type Sector Spiral and intermediate Axis.
To boring holes in 91 framing plates for the detent and blind or Index Axes and also reboring the hole for Carrying or figure Wheel Axis.
To boring holes in 80 framing plates for the axis of Arms for pointing out Nines and also for cutting out a recess in the edge of the plates for clearing the Socket of the arms for pointing out the Nines, a hole drilled and tapped in each of the above plates for receiving a Screw which retains one end of the Spring Case of Carrying Lever.
To cutting out a recess in the edge of 78 framing plates for clearing the end of roller Lever.
126 Additional Steel Screws for fixing the Sockets to framing plates on which the Calculating Wheels turn on.
To smooth filing 47 Gun Metal Catches for Carrying Levers.
47 Additional Steel Springs fitted and screwed to the above Catches.
47 Additional Steel Screws for fixing the above Springs to the Catches.
To tapping a hole in the end of 42 Gun Metal Carrying Levers for receiving a Screw of the Catch and also for drilling a hole in each of the above Levers and fitting in a Steel Stud for the end of the Spring of the Catch to act against.
112 Steel Screws for fixing the Carrying Arms to the Axis.
36 Additional Steel Capstan headed Screws for fixing Spring Cases to bolting Levers.
20 Additional Gun Metal Arms for connecting the Spring Cases to carrying Levers, smooth filed holes drilled for receiving the Screws which fix them to the Carrying Levers, holes drilled and tapped for receiving the Screws which connect the Spring Cases to them.
264 Steel Screws for fixing the spring Arms to Carrying Levers.
20 Additional Steel Screws for connecting the Spring Cases to the Spring Arm of Carrying Lever.
112 Steel Screws for connecting the Spring Cases of Carrying levers to the framing plates.
To smooth filing and turning 13 Gun Metal Barrels for putting the Calculating Axis &c. in and out of Gear and also drilling and tapping 48 holes in each of them for receiving the Screws which fix the Eccentrics to the sides of the Barrels.
40 Gun Metal Rings smooth turned which are intended to be cut for the Eccentrics of Barrels.
To cutting a slit in the forked end of 6 Gun Metal roller Levers for putting the Calculating Axis in and out of Gear, a hole made for receiving one end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring case to the Lever, a recess made in the other end of the Lever for receiving a Steel roller a hole drilled and tapped for receiving a Screw for the Steel Roller to turn on.
Six Steel Rollers for the above Levers bored turned and hardened.
To cutting a slit in the forked Arm of 14 Gun Metal Levers for putting the bolting and carrying Axis in and out of Gear, a recess made in the long Arm for receiving one end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to the Lever, a recess made in the Short Arm for receiving a Screw for the Steel Roller to turn on.
Fourteen Steel Rollers for the above Levers bored turned and hardened.
To cutting a slit in the forked Arm of 7 Gun Metal Levers for putting the intermediate Axis in and out of Gear, a recess made in the other Arm for receiving a Steel Roller, a hole drilled and tapped for receiving a screw for the Steel Roller to turn on.
Seven Steel Rollers for the above Levers, bored turned and hardened.
Two Gun Metal Carriages for supporting the ends of the Axis on which the Levers for putting the bolting Axis in and out of Gear turns on, bored turned and smooth filed.
To boring turning and smooth filing twelve Gun Metal Brackets (6 single and 6 double ended) for supporting the Axis of the Levers which puts the Carrying and intermediate Axis in and out of Gear.
To cutting a recess in the short end of the Gun Metal roller Lever (for retaining the horizontal Carrying Axis in a certain position) for receiving one end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to a Lever a recess cut in the long end for receiving a Steel Roller a hole drilled and tapped for receiving a Screw for the Steel Roller to turn on.
A Steel Roller for the above Lever bored turned and hardened.
To cutting a recess in each end of a Gun Metal Roller Lever for retaining the horizontal bolting Axis in a certain position one end of which is to receive the end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to the Lever, the other end is to receive a Screw for the Steel Roller to turn on.
A Steel Roller for the above Lever bored turned and hardened.
To cutting a recess in each Arm of a Gun Metal Roller Lever (for holding the 48 Wheel and Barrels in a certain position) one end is to receive the end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to the end of the Lever, the other end is to receive a Steel Roller, a hole drilled and tapped for receiving a Screw for Steel Roller to turn on.
A Steel Roller for the above Lever, bored turned and hardened.
To filing 7 Gun Metal Levers for retaining the Vertical Carrying Axis in a certain position a recess made in one end for receiving one end of the Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to the Lever, a recess made in the other end for receiving a Screw for the Steel Roller to turn on.
Seven Steel Rollers for the above Levers bored turned and hardened.
To tapping the ends of five Gun Metal pillars with square ends (for supporting the upper platform, a hole bored across the pillar and countersunk on both sides through which the Axis passes for supporting the Lever that puts the bolting Axis in and out of Gear.
Ten Gun Metal Collars bored and turned and fitted to the Countersunk hole in the above Pillars.
To filing up Nineteen Gun Metal Spiral Arms.
To rough turning Seven Steel Axes for Calculating Wheels 7 feet 3 ¹/₈ inch long ⁷/₈ inch diameter.
To rough turning Six Steel Axes for bolting Arms 7 feet long ³/₄ inch diameter.
To rough turning One Steel Axis for Eccentrics 6 feet 11 ³/₄ inch long ³/₄ inch diameter.
To rough turning Seven Steel Axes for Carrying Arms and figure wheels 7 feet 5 ½ ins long ¹⁹/₃₂ inch diameter.
To rough turning Seven Steel Axes for intermediate Wheels 6 feet 4 ³/₄ in long ¹⁹/₃₂ inch diameter.
To rough turning fifteen Steel framing Bolts of the following lengths
4 [of] 6 feet 5 ⁵/₈ in
2 [of] 6 feet 7 ¹/₈ in
3 [of] 6 feet 11 ⁷/₈ in
4 [of] 7 feet 1 ¹/₈ in
2 [of] 7 feet 2 ⁵/₈ in [all of] ¹¹/₁₆ inch diameter.
To rough turning Seven Steel Axes for Alarm Arms.
Nineteen Gun Metal Levers for limiting the number of figures to be printed bored turned and smooth filed, a recess is made in the short arm for receiving one end of a Spring Case, a hole drilled and tapped for receiving a Screw which connects the Spring Case to the Arm.
Nineteen Gun Metal Spiral Spring Cases for the above Levers, bored turned and the female screw cut in one end and the other end is fitted to the Arm of the above Lever, a hole drilled for the Screw to go through which connects it to the Arm.
Nineteen Steel Screws for fixing the above Spring Cases to the Levers.
Nineteen Gun Metal Screwed Nuts with milled heads fitted to the above Spring Cases, a hole bored through the centre for the Piston Rod to pass through.
Nineteen Gun Metal Piston Rods for the above Spring Cases, a hole drilled through the Spherical end for a Bolt to go through for connecting them to the framing plates.
Nineteen Gun Metal detents for retaining the Levers which limit the number of figures to be printed bored turned and fitted to the Socket of the detents for Carrying Levers.
Six Gun Metal pillars with square ends for supporting the frame of Copper Plates bored turned and the square ends smooth filed.
A Gun Metal endless Screw Wheel and two internal Cones for moving Ribbon axis.
Two Gun Metal external Cones to fit the internal Cones aforesaid, bored turned and the Screw cut on one end for receiving a screwed Nut of Clutch, a recess turned out for receiving a Spiral Spring and three parallel grooves for sliding on feathers or Ribbon Axis and also for preventing them from turning round.
A Gun Metal casting of Bevel Wheel on first Axis for giving motion to a bevel Wheel on the Cam for lifting Type Sector.
A Gun Metal Casting of Cam Wheel and Cam for lifting Type Sector.
A Gun Metal Casting of Lever for raising and locking Type Sector.
Two Gun Metal Castings of Spring box for Type Sector.
Five Gun Metal Castings of Type Sector.
Two Gun Metal Castings for Sixty intermediate Wheels on twenty Axis.
Two Gun Metal Castings of first and loose Sector Wheels on twenty Axis.
Three Gun Metal Castings of Clutches for the above Sectors.
A Gun Metal Casting of Pinion on first Axis for driving Sectors on twenty Axis.
Nine Gun Metal Castings for moveable parts of Sector Wheels.
A Gun Metal Casting of Sector Wheel on Great Axis for giving motion to the horizontal Calculating Axis.
A Gun Metal Casting of starting tooth for putting sectors and great Axis in Gear with a Wheel on horizontal Calculating Axis.
A Gun Metal Casting of Wheel on horizontal Calculating Axis which receives motion form the Sector on Great Axis.
A Gun Metal Casting of starting tooth of Spur Wheel on horizontal Calculating Axis.
A Gun Metal Casting of Roller Wheel on horizontal Calculating Axis.
A Gun Metal Casting of Sector Wheel on great Axis for giving motion to Spur Wheel on horizontal Calculating Axis.
A Gun Metal Casting of starting tooth of Sector Wheel on great Axis for horizontal carrying Axis.
A Gun Metal Casting of starting tooth of Spur Wheel on horizontal Carrying Axis.
A Gun Metal Casting of first Sixty Wheel.
A Gun Metal Casting of ring for the above Wheel.
A Gun Metal Casting of second Sixty Wheel.
A Gun Metal Casting of third Sixty Wheel.
A Gun Metal Casting of Spur Wheel on horizontal Carrying Axis.
The following relates to that part of the Machine deliv[er]ed to Mr Babbage.
To a Gun Metal Lever or handle for giving motion to the Machine.
Two Gun Metal Wheels for carrying the Catches which give motion to the wheels on the second difference Calculating and bolting Axis, bored turned smooth filed and the teeth cut in them, holes drilled and tapped for receiving the Screws which connect the Catches to them, a hole drilled and tapped in one of them for receiving a Screw which fixes it to the handle.
To a Steel Screw for fixing one of the above Wheels to the handle.
Two Steel Screws and Gun Metal Washers for retaining the above Wheels on the Axis.
Two Gun Metal Catches for the above Wheels bored turned and smooth filed, two Steel Springs and two Screws for fixing the Springs to Catches, two Steel Screws for connecting the Catches to the Wheels.
Two Gun Metal Wheels for communicating motion from the second difference to the first difference Calculating Axis, bored turned, smooth filed and teeth cut in the edge, on the upper side of one of the Wheels is a projecting ring with two notches for the Catch to lay hold of to turn it by.
To a Gun Metal Catch for preventing the above wheels turning in a wrong direction, bored turned and smooth filed, a Steel Spring and Screw for securing the Spring to the Catch and a Steel Screw for the Catch to turn on.
Four Gun Metal Wheels for communicating motion from the Second difference to the first difference bolting Axis and also to a Catch Wheel which is fixed on the first difference Carrying Axis bored turned smooth filed and teeth cut in the edge, a hole drilled and tapped in an Arm of one of the above Wheels which is placed on the Carrying Axis for receiving a Screw for carrying a catch which lays hold of the Catch Wheel on the Carrying Axis.
To a Gun Metal Catch which is screwed to the arm of the aforementioned Wheel bored turned and smooth filed, a steel spring and screw for fixing the Spring to the Catch and the Steel Screw for fixing the Catch to the aforementioned Wheel.
To a Gun Metal Bridge for supporting one of the above Wheels, turned and smooth filed, a Cylindrical Stud projects on the upper side for the Wheel to turn on, a hole drilled and tapped in the end of the Stud in which is a Steel Screw and Gun Metal Washer to prevent the Wheel coming off, a hole for receiving the upper end of the first difference Calculating Axis, four holes drilled through the Bridge and four Steel Screws which fix the Bridge to the upper square framing plate.
To a Gun Metal Catch Wheel which is fixed to the first difference Carrying Axis bored and turned.
To three Gun Metal Wheels which are fixed on the upper end of the Carrying Axis, the Wheel on the first difference Carrying Axis gives motion to the Wheel on the Table and also the Wheel on the Second difference Carrying Axis, bored turned smooth filed and the teeth cut in them.
To three Steel Carrying Axes 24 inches long ¹⁹/₃₂ inch diameter turned and ground parallel, holes drilled for receiving the end of the Screws which fix the Carrying Arms to the Axis.
To adjusting the ends of thirteen Gun Metal Carrying Arms and also to drilling and tapping a hole in each for receiving the Screws which fix them to the Carrying Axis.
Two Steel intermediate Axes 24 inches long ¹⁹/₃₂ inch diameter turned and ground parallel, a Steel Collar fixed on each end of one of the Axis and on the lower end of the other.
Two Gun Metal intermediate framing plates for supporting the above Axis planed parallel and the edge smooth filed, in each of the plates are two holes for receiving the intermediate Axis, one hole for receiving the end of a brass pillar, three holes for receiving Screws which fix the plates to the pillar, an oblong hole in the end of the lower plate a screwed hole in the end of the upper plate for receiving the Screws which fix them to the lower and upper square framing plates, and to allow them to slide out so that the intermediate Wheels may be put in and out of Gear with the figure Wheels and also a hole in the lower framing plate in which is fixed a Steel Stud for an intermediate Axis to turn on.
Two Steel Screws and Gun Metal Washers for fixing the above plates to the square framing plates.
To a Gun Metal Pillar for connecting the intermediate framing plates together with a flanch ³/₄ inch from each end, three holes drilled and tapped in each flanch, the ends of the Pillar are turned to fit a hole in the ends of the intermediate framing plates, and also a hole in the upper and lower square framing plates.
Six Steel Screws for fixing the intermediate framing plates to the Pillar.
Three Gun Metal Wheels, bored turned smooth filed and teeth cut in them, two of which are fixed on the lower end of the intermediate Axis, and the third turns on a Steel Stud which is fixed in the lower intermediate plate and communicates motion from one intermediate axis to the other.
Five Gun Metal intermediate Wheel which may be put in Gear with any of the figure Wheels on the Table and second difference Carrying Axis bored turned and teeth cut in them, a hole drilled and tapped in the boss of each of them for receiving a Screw for fixing them in any required place on the intermediate Axis.
Five Steel Capstan headed Screws for fixing the Wheels to the Axis.
Three Steel Axes for detents 22 inches long ⁷/₁₆ inch diameter turned and ground parallel.
Three Steel Axes for Blinds 21 ½ inches long ³/₈ inch diameter turned and ground parallel.
To filing the edges of two square framing plates, three holes drilled in the upper square framing plate for the Alarm Axis, three holes drilled and tapped for receiving the Screws which fix one end of the Spring Case of the Alarm Axis, four holes drilled and tapped for receiving the Screws which fix the Bridge to it, six holes drilled and tapped for receiving the Screws which fix the figure Rings to it an oblong hole made for the Screw to go through which fixes it to the upper intermediate framing plate, three holes drilled and tapped for the Screws for fixing the alarm Bells, a hole bored in each of the upper and lower square framing plates for the ends of the Pillar of the intermediate frame to turn in, the following holes bored in the lower square framing plate, one for the Socket of one of the figure Wheels to go in, one for the bolting Arms to go in, one and tapped for the Stud of the Roller Levers, and the Steel Stud turned Screwed and fitted to the hole, one for the stud which is fixed to one end of the Spring Case for a bolting Lever, and the Gun Metal Stud turned and fitted to it, and one tapped for the Screw to go in which holds one end of the bottom intermediate framing plate.
Four additional Gun Metal Sockets or pillars for supporting the framing plates ¹³/₁₆ inch long bored and smooth turned.
Two additional Gun Metal Sockets or pillars for supporting the framing plates 2 ¹¹/₁₆ inch bored and smooth turned.
Two Gun Metal Pinions for communicating motion from the bottom upper Calculating Wheel on the first difference Axis to the bottom lower Calculating Wheel on the second difference Axis, bored, turned and the teeth cut in them, a hole drilled and tapped in the boss of one of the Pinion for receiving a Screw for retaining it in or out of Gear and a Steel Screw fitted to it.
An additional Gun Metal Lower Calculating Wheel bored turned and smooth filed, the teeth cut in the edge and also the semi circular teeth on the upper side.
An additional Gun Metal Arm for preventing bolting, bored turned smooth filed and fitted to the above Wheel.
Two additional Steel Screws for screwing the above Arm to the Wheel.
Two additional Gun Metal inclined planes for preventing bolting for the above Wheel smooth filed.
To adjusting the inclined planes on Seventeen of the lower Calculating Wheels.
To cutting a notch in the ends of Seventeen of the Carrying Levers for the detents to lay hold of, and the part adjusted where the Carrying Arm acts against, two holes drilled and tapped in the Sockets of the Carrying Levers for receiving the Screws which fix the spring arms to them, a recess made in the side of the Lever to which is fixed a piece of buff leather for softening the momentum of the return of the Carrying Lever against the Bridge.
Seventeen Steel Spiral Springs for the Spring Cases of Carrying Levers.
To adjusting the ends of Seventeen Gun Metal Catches.
To cutting the teeth in twelve Gun Metal figure wheels.
To covering fifteen figure wheels with allata and three with Silver, and also turning polishing and engraving the figures on them.
A Gun Metal Ring fixed to the underside of the square framing plate by three Steel Screws and concentric to the Table Carrying Axis, having two allata rings fitted to it, turned polished and figures engraved on.
A Gun Metal Ring fixed to the first difference Carrying Axis with an Allata Ring fitted to it, turned polished and engraved, this Ring points out the time for adjusting the Machine and when the Calculations are complete.
To polishing and engraving an Index on Nineteen Gun Metal Blinds for pointing out the proper figures on figure wheels.
To cutting a Notch in Eighteen Gun Metal Wheels for pointing out the Nines so as to admit the alarm arm to drop.
To filing up Eighteen Gun Metal Nuts for securing the alarm wheels to the figure wheels and adjusting the arms for receiving the detents.
To adjusting the ends of Sixteen of the alarm arms.
To drilling and tapping a hole in the boss of Sixteen of the above arms for pointing out the Nines (or any required number) for receiving a Screw which fix them to the Axis, slits cut into the sides so as to admit them to slide up and down on the head of a small Steel Screw which is fixed in the side of the Alarm Axis, but the Screw prevents them from turning round on the Axis.
Sixteen Steel Screws for fixing the above Arms at the required position on the Axis.
Sixteen Steel Screws for preventing the above arms turning on the Axis.
Three alarm Bells and three Steel Screws and Washers for fixing them to the underside of the upper square framing plate.
A hammer fixed to each of the three alarm Axis for striking the Bells.
Three Steel Screws for fixing the hammers to Levers and three Steel Screws for fixing the Levers to Alarm Axes.
Three Gun Metal Spiral Spring Cases bored turned and female screw cut in one end, the other end has a countersunk hole in it, for receiving a Screw which fix them to the upper square framing plate.
Three Steel Screws and three Gun Metal Collars for fixing the above Spring Cases to the square framing plate.
Three Gun Metal Screwed Nuts with milled heads and hole through the middle fitted to the above Spring Case.
Three Gun Metal Piston Rods for the above Spring Cases with a countersunk hole in one end for receiving a Screw which connects them to an arm on the top of the alarm Axis.
Three Steel Screws for connecting the above Piston Rods to the arms on the Alarm Axis.
Three Steel Spiral Springs for the above Spring Cases.
Three Gun Metal Arms fixed on the upper end of Alarm Axis for connecting the above mentioned Springs to them.
To smooth filing the Arms of Seventeen Gun Metal bolting Arms and the Steel Studs adjusted, and also cutting and adjusting the Eccentrics for locking Roller Levers.
To drilling and tapping a hole in Eleven Gun Metal bolting Levers for receiving the Screw which connects the Spring Case to the Lever and the Steel Studs adjusted.
Twenty two Steel Spiral Springs for Eleven of the double ended Spring Cases for bolting Levers.
Two Steel Springs for holding back two of the bolting Levers.
Fifteen Steel Springs for detents.
Fifteen Steel Screws for fixing the above Springs to framing plate.
To a Mahogany Table for supporting the Machine a Glass Case to cover it.
Amounting to £1782-11-4 ³/₄
Feb^y 8th 1833 Examined the foregoing Articles
Feb^y 20th 1833 Examined the Acc^t
(Signed) Bryan Donkin
Joshua Field



  Rec^d 28 Feb 1833 (Signed) CB